The boy suddenly sent an urgent message: "sister, go to the roof. Immediately. "


    Children rarely use such an urgent tone.


    Liu Yao knew that there must be something very important and urgent. Tong Tong would do this. Therefore, she called out to Shen Fang: "Fangfang, if I haven''t come back from self-study in the morning, you can ask for leave for me." And then he ran out.


    Shen Fang called out in the back, "Yao Yao, where are you going?"


    "I''ll do something!"


    Liu Yao flies out of the classroom and rushes to the roof.


    The rooftop of the teaching building is always in a semi closed state, and its door is mostly closed. So very few students come up. When Liu Yao first came up to let the children bask in the sun to replenish their energy, she climbed in through the window of the corridor.


    This time, the door was locked again.


    Liu Yao had to get in through the window. The window of the corridor is not high, only about one meter, but there is no danger.


    But Liu Yao climbed into the window and went up to the roof, and found that the roof was empty, and there was nothing strange about it.


    What''s going on?


    Liu Yao carefully took out the mobile phone, or no suspicious place.


    Liu Yao is going to send a message to the children with his mobile phone.


    All of a sudden, the mobile phone issued a strong "beep" alarm sound, and the signal indicator light kept beating the red flashing light!


    Liu Yao is shocked!


    This kind of strong warning signal only occurs when the children are seriously lack of energy.


    "Tong Tong, Tong Tong, what''s wrong with you?" Liu Yao knows that when Tong Tong turns on the signal alarm, she can directly hear her saying: "are you out of energy again?"


    .


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