(　　　)1.−　　　　　　I finish my homework today,Mum?
　　　　−No,you needn't.But you
　　　　　　finish it before Monday.
　　　　
A. Must；can B. Need；may
　　　　
C. Must；have to
(　　　)2. Could you 　　　　me a hand?
　　　　
A. giving B. gives C. give
(　　　)3. To keep healthy,all of us
　　　　know something about food safety.
　　　　
A. shouldn't B. should
　　　　
C. can
(　　　)4. The woman is bleeding(流血).She 　　　　go to hospital quickly.
　　　　
A. could B. can't C. must
(　　　)5.−Why 　　　　we swim in this river?
　　　　−Can't you see the sign　“No swimming”?
　　　　
A. do B. can't C. must
(　　　)6. Children under3years old
　　　　ride bikes on the road.
　　　　
A. can B. mustn't C. may
(　　　)7. My bag is blue.　This red one 　　　　be Helen's.She bought a red bag yesterday.
　　　　
A. can B. cannot C. mustn't

一、1. C 2. C 3. B 4. C 5. B 6. B 7. A

1. She can ride a bike now. (改为否定句)
　She__________ __________a bike now.
2. What must you do to cross the road safely? (改为否定疑问句)
　What__________ __________ __________do to cross the road safely?
3. You must wait on the pavement. (改为一般疑问句)
　__________ __________wait on the pavement?
4. The bus must stop because the traffic light is red. (对画线部分提问)
　__________ __________the bus stop?

二、1. can't/cannot ride 2. must you not 3. Must I/we 4. Why must