--- Look! It ____ be Jack on the playground.---It ____ be him. Because I saw him enter the school library just now.A. may; mustn’t B. must; can’t C. can; can’t
—Where is Miss Wang now? —Look, there she is! She __________ with many old people.
The singer __________ in London in 2010.
We’d better __________ some food now.
Mr. White is fixing his computer because there is __________ wrong with it.
—Must I sweep the floor now, Miss Jackson? —No, you __________. You can do your homework first.