— Listen! Is that Linda singing in the next room?

— No, it ________ be her. She is still in Shanghai.

A. mustn’t                      B. can’t       C. may not                     D. might not

—Listen! Is that Millie singing?
—No. It _____ be Millie. She has gone to Beijing.

—Listen! Is that Millie singing?

—No. It _____ be Millie. She has gone to Beijing.

A．may              B．can’t            C．must             D．mustn’t

 —Listen! Is that Pingping playing the guitar? 

       —No. It __________be Pingping. He has gone to Beijing.

     A. mustn’t            B. may              C. can’t               D. must

—Listen! Is that Pingping playing the guitar? 

—No. It __________be Pingping. He has gone to Beijing.

1. A.
   mustn’t
2. B.
   may
3. C.
   can’t
4. D.
   must