— Who’s singing in the next room?
— It ______ be Mary. She ______ New York.
| A．mustn’t, is in | B．must, has gone to | C．could, has been in | D．can’t, has gone to |
Amy isn’t as quiet as she ______. She is quite outgoing.
| A．did | B．would | C．used | D．used to be |
— Don’t ______ this old man. It’s not polite.
— Sorry, we won’t do that again.
| A．end up | B．laugh at | C．make up | D．give up |
.—It’s nice of you to help me with my homework.— ___________.
| A．It’s right | B．It doesn’t matter | C．Thank you | D．It’s my pleasure |
I ________ my homework while my parents ________ TV at 9 last night.
| A．did; have watched | B．had done; were watching |
| C．was doing; were watching | D．would do; were watching |