Fang Hua is playing with his mobile phone, and Lao Yao is also playing with his mobile phone.

Fang Hua put on the quilt, covered his head too, and pretended to sleep. While watching the video, he chatted with the four demons with taste.

"I was unlucky in the morning, I was taken away by an unreasonable person, but I got it back!"

"Got it back? Who received your phone? The four demons were a little puzzled.

"It's a teacher, I think I'm old, so I'm nosy, and our homeroom teacher even quarreled with him."

"Shouldn't the school not allow mobile phones, what's your situation today?"

"We are a sports day today, so the head teacher agreed that we can bring our mobile phones to school for the next two days, but I wanted to take a picture with my mobile phone, and the old guy found out."

"I see..."

The four demons thought about it for a while, and felt that something was not right, since the mobile phones were all collected by the teacher, how could they get them back?

"No, you stole your phone!"

"Almost, the process is too exciting, it's the same as making a spy movie." Fang Hua's heart was still beating faster when he thought about it now, he had never done such a thing before.

"Then you are amazing, I have also received a mobile phone before, but I don't have the courage to take it at all, and the teacher didn't return it to me until I graduated." The four demons also remembered an anecdote from high school, when he was sad for several days after his mobile phone was collected, and he didn't dare to tell his parents.

"Actually, I didn't come up with the idea, my friend came up with it." Fang Hua only participated in Lao Yao's plan, but Lao Yao still has a hand, and he really has a lot of bad ideas.

"Then your friend is powerful and bold." The four demons smacked.

Just as Fang Hua was chatting energetically, Ah Xiang came back. After he came back, he sat on the edge of Lao Yao's seat, "How is it, did you get your mobile phone?" ”

"Take it back, look at Fang Hua, you're playing there!" Old Yao Nunu mouthed and pointed to a mass on the other side. "That's fine, eh, by the way, did you get that lock back?"

Lock?

The original lock of the office?

Lao Yao was stunned for a moment, he felt something heavy in his pants, he touched it, and took out the lock from his trouser pocket; Lao Yao's expression was confused for a moment, he picked up the lock again, looked at it carefully, and looked at it for a while, before he lowered his head deeply, pinched the corners of his eyes with his hands, how could he forget this matter!

"It's over!" The desperation in his tone could not be concealed.

"No, it won't!" Ah Xiang opened his mouth wide, with a look of surprise, how could these two people make such a low-level mistake! It's too bad now, it's a big deal!

Fang Hua didn't know it yet, he was still playing with his mobile phone under the quilt there.

Lao Yao stood up, walked over, and quickly slapped Fang Hua's quilt, Fang Hua was so frightened that the quilt also shook off. "Why, you're scared me to death!" Fang Hua saw that it was Lao Yao, and he breathed a sigh of relief. "I thought it was the head teacher, shoot so hard, what's wrong?"

Fang Hua didn't see the solemnity on Lao Yao's face, "Fang Hua, I want to tell you something, you should be mentally prepared." His lips trembled, and his hands clenched into fists.

"What's the matter?" Fang Hua hadn't realized that the catastrophe was coming, he didn't know why Lao Yao was so serious.

"We didn't change the locks back." After Lao Yao said this, he always felt like throwing up, and an unprecedented sense of fear pressed on his heart, and he didn't know how to deal with it.

"What?! The lock was not replaced! Fang Huaren was stupid, he felt as if he was about to crack, and he almost shouted, "What about the original lock?" Where did it go? ”

"In my pants pocket, I forgot to change it back." Lao Yao opened his palm, and there was a lock lying there, "What should I do now?" ”

"What to do? What can I do......" Fang Hua sat down in his seat like a deflated ball, why would he forget such an important matter, he had been thinking about it at the time, and when it was done, he quickly changed the lock back. Why do you forget!

……

Several figures walked past the door of Class 8, one of which was the head teacher of Class 4, who walked back to the office with a handout and a conversation and laughter with his colleagues.

"Today's students are okay, they haven't been disturbed by the sports meeting, and they are quite serious."

He happily lit a cigarette and waved it at the head teacher of Class 6, "Do you want it?" ”

"It's okay, I have, don't want it." The head teacher of Class 6 waved his hand, "Eh, Teacher Jiang, I heard that you quarreled with Teacher Gao this morning, what happened?" ”

"Don't say it, Gao Wei, it's just young and vigorous, I don't know the rules, the school clearly stipulates that mobile phones are not allowed, he has to say that he wants to give students a break and rest, let them bring mobile phones to school, what kind of system do you say! Originally, these students were in the third year of high school, and they should study hard, and they couldn't be slack, and he also went backwards and let them play with their mobile phones, isn't this harmful to them! Besides, the school also has rules, and you are blatantly violating school discipline, isn't this a rebellion? ”

The more the teacher of the fourth class talked, the more angry he became, he took a hard puff of his cigarette, snuffed out the cigarette butt, and threw it into the small flower bed by the fence.

"Don't be angry, Mr. Jiang, compared to you, Mr. Gao is still a junior, and he must not be as thoughtful as you, so he can afford to lose his temper with him." The head teacher of the sixth class hurriedly comforted him on the side, "Everyone is looking up and not looking down, there is no need to be so angry." ”

The head teacher of the fourth class just "snorted" and did not say anything else.

The two walked to the door of the office, and the head teacher of the sixth class took out the key and stuffed it into the lock, he thought that the lock would make a smooth "click" sound as usual, and the latch bounced up powerfully.

He twisted to the right, but the lock didn't move.

He twisted it several times, but the lock was not moved at all, and the latch did not respond at all.

"Alas, it's strange, why can't the door open?" He pulled out the key and looked left and right, no problem?

"How?" The head teacher of the fourth class saw that the lock of the door was not opened, and he stepped forward, "There is a problem with the lock?" ”

"yes, I can't screw it, and there's nothing wrong with the key?" The head teacher of Class 6 was strange, and the switch was still normal in the morning.

"I'll give it a try." The head teacher of the fourth class took out the key and inserted it into the lock, and it was smooth here, but he twisted it to the right, and he couldn't twist it at all. He twisted it to the right again, and everyone jumped and jumped, and he couldn't open it at all.

"Hey, what's going on with this lock?" The head teacher of the fourth class pulled out the key and looked at it carefully, and the key was intact and there was no problem.

"You go to the first class to borrow the key, the door lock of the first class is the same as ours, see if you can open it." The head teacher of the fourth class was a little anxious, and his office bag was still in the office.

"Okay, I'll borrow it." The head teacher of the sixth class borrowed the key from the first class and tried again, but this time the head teacher of the sixth class used all the strength of the milk, and he couldn't twist it at all.

"Has this lock been changed? When did you change the locks, don't you notify us? The head teacher of Class 6 sat on the steps by the door of the office, thinking about why the lock could not be opened!

"Go, go to the Security Section and see what they can do!"

The head teacher of the fourth class said, and hurried to the security section without stopping.

"The lock won't be opened?" The chief of the security section looked surprised, "We didn't change the lock, why can't we open it?" ”

"Teacher Zhang, I'm this old, do I still want to lie to you, the door lock really can't be opened!"

The head teacher of the sixth class was on the side, nodding along with the words of the head teacher of the fourth class.

"Then take me to see it." The chief of the security section took a large pair of pliers, "I'll see if I can cut it." ”

When I arrived at the door of the office, the head teacher of the fourth class opened the door again, but the door could not be opened. "I'll cut it open." The chief of the security section used large pliers to clamp the weak point of the door lock.

It's a pity that the quality of the door lock is so good that the big pliers just leave a little trace on it, and it has no effect at all. "Hey, which naughty student changed this, the quality is pretty good." The chief of the security section checked the lock on the door, "Let's find someone to pick the lock." ”

"No, Mr. Zhang, don't you have concentrated hydrochloric acid, you can see if you can get some to remove the lock." The head teacher of the fourth class came up with an idea.

"Do you know the material of the lock cylinder?" The head of the security section asked the head teacher of the fourth class.

"I don't know." How could he possibly know this.

"Okay, then I'll try." The chief of the security section nodded, and had to try all the thick acid.

After a while, the chief of the security section came with a few small bottles and droppers, "All of them have been brought, nitric acid and sulfuric acid have been brought!" ”

"That's okay, I'm sorry for you, Mr. Zhang." The head teacher of the fourth class thanked him repeatedly.

"Don't worry, don't thank me yet, there is a question mark over whether it can be dissolved." The chief of the security section shook the lock while dripping concentrated hydrochloric acid into it.

After a while, there was a strange sound coming from the lock, and at the same time, there was also the sound of air leaking, and then, with a slight pull from the head of the security section, the latch was opened.

"It's okay, it's open."

"Oh, thank you so much Teacher Zhang, if it weren't for your help, we wouldn't know what to do." Both the fourth and sixth class teachers expressed their gratitude to the head of the security section.

"It's fine, but who changed this lock, do you know? Also, see if you have lost anything, and if you do, tell me. ”

"Okay, I'll look for you then."

The chief of the security section nodded and left with his things. The fourth and sixth class teachers hurriedly rushed into the office and turned on the lights to see if anything was missing.

Thankfully, there was almost no difference between the office and before leaving, and there were no test papers and belongings missing, and it seemed that the person who changed the lock was just playing pranks with them, not stealing things.

"It was a prank by the students, and I don't know which teacher was playing tricks, but we ran into it." The head teacher of the sixth class shook his head helplessly, "The current students are so bold that they even dare to change the door lock of the teacher's office, I didn't teach them this when I was in class." ”

"Really, it's getting worse and worse, why are children so difficult to teach now?" The head teacher of the fourth class couldn't figure out why he was playing a prank on his teacher, and strictly speaking, this was beyond the scope of pranks. He just couldn't figure it out.

"Forget it, Mr. Jiang, it's useless to think about it again, let's go home first." The head teacher of the sixth class could see it, and he packed up his things, "Then I'll go back first." ”

"Okay, slow down on the road." After greeting the head teacher of the fourth class, the head teacher of the sixth class left, and it seemed that he didn't take this matter to heart at all. However, the head teacher of the fourth class was worried and stood at the desk for a long time.

I can't think through it, I can't think of it. The head teacher of the fourth class didn't know who changed the lock, but it was most likely aimed at himself, and he knew it.

Just don't think about it for a while, the head teacher of the fourth class comforted herself.