—Listen, our music teacher is singing in the office.

—It__________be our music teacher. I saw her leave school a few minutes ago.

A.can't B.doesn't C.mustn't

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People spend about 1/3 of their lives doing one thing: sleeping. Every year, there is a day for people around the world to celebrate the importance of good and healthy sleep — World Sleep Day. This year, it falls on March 16. The theme(主題) is “Breathe Easily, Sleep Well.”

Sleep is like food for the brain(大腦). 1. sleep helps the body and brain grow and develop. People of different 2. need different hours of sleep. According to the Nation Sleep Foundation in the US, adults need seven to nine hours of sleep every night. For students aged 10 to 17, they need about eight to nine hours per night.

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There is a “murderer” among us. You may wonder what is happening. Let me tell you!

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It be the postman at the door. It’s only five o’clock in the morning.

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On March 30, a forest fire 1.(take) place in Liangshan, Sichuan. So far, more than 30 people2.(lose) their lives. Over 3, 000 firemen have thrown themselves into the fire fighting actively. The brave firemen have spent over ten days 3.(fight) against the fire, but it's very difficult4.(put) it out. Although it's very hard and dangerous for the firemen, they still keep on5.(work) there.

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