() 5. —Mr. Xu,must we hand in our reports today? —No,you .

   A. mustn't   B. can't   C. shouldn’t   D. don't have to

() 4. There will be an important meeting tomorrow. You arrive on time.

   A. may   B. can   C. could   D. must

() 3. We stop when the traffic light turns red.

   A. may   B. must   C. could   D. can

() 2. It's the library!You shout here.

   A. may not   B. don't have to   C. could not   D. must not

() 1. Li Ping left his homework at home,so he return home for it.

   A. can   B. must   C. has to   D. had to

6. —Let's decide (start) the plan,Jim.

—How about next Monday?

5. 一Can you tell us (do) next?

—Sure. We’ll choose a person to host the party.

4. 一So many nice dresses here!

—Yes,but I don't know (buy) .

3. —Can you tell me how to choose courses,Miss Li?

—Oh sorry,but I can tell you (talk to) .

2. —Can you clear the table,please?

—Yes,but Im not sure (put) everything.