--Must we collect the waste paper and bottles now?

--____________. You can do it after class.

A. Yes, you must                 B. No, you needn’t 

C. Yes, you may                  D. No, you mustn’t

-Must we collect the waste paper and bottles now?

-________．You can do it after class．

1. A.
   Yes, you must
2. B.
   No, you needn't
3. C.
   Yes, you may
4. D.
   No, you mustn't