含答案（3份）
1. To keep the children safe，all the workers are trying their best to b the bridge.
2. The students study harder and harder. F , their dreams came true.
3. Many young students like working on the I for a long time. It’s bad for their eyes.
4. — Excuse me, where is Miss Hu, Liu Ming? I have some q to ask her.
—She is in the office.
5. We should do our best to p all kinds of diseases.
( ) 1. —May I use your bike, Jim?— Sure, .
A. go ahead B. you can ask Bill
C. you can’t D. that’s all right
( ) 2. — Must I take part in the activity?—No, you . You’re too young.
A. mustn’t B. don’t
C. don’t have to D. don’t need
( ) 3. You’d better wash your hands before meals you healthy.
A. keep B. kept
C. keeping D. to keep