--Listen! Kate is playing the piano in the next room.

　　--It _______________be Kate. She has gone to Hangzhou to visit the Cross-sea Bridge.

　　A. needn't　　　　　　B. mustn't　　　　　 C. can't　　　　 D. shalln't

-- Who's singing in the next room?　　

--- It ____ be her . She went to New York yesterday evening

　　   A. can't           B. must          C. shouldn't         D. can

--- Listen! David is talking happily with his mother in the next room.

　--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.

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

--Listen! Kate is playing the piano in the next room.

　　--It _______________be Kate. She has gone to Hangzhou to visit the Cross-sea Bridge.

　　A. needn't　　　　　　B. mustn't　　　　　 C. can't　　　　 D. shalln't

-- Who’s singing in the next room?　　
--- It ____ be her . She went to New York yesterday evening