---I saw Li Ming standing in the teachers’ office.
---Really? He _______ basketball with other boys on the playground just now.
A. has played B. was played
C. was playing D. is playing
--- Would you like _____ camp with me?
--- I’d like to. But I am busy ______ my homework.
A. to go; to do B. to go; doing
C. going; to do D. going; doing
--- Lin Tao, can I use your English dictionary?
--- Sure. But you _______ return it before the class.
A. must B. can
C. may D. would
--- What do you think of pollution of the big factory?
--- It’s a serious problem. We should _____ all the people to do something for it.
A. put up B. call up
C. set up D. give up
There is little water in your cup, ________?
A. isn’t it B. is it
C. isn’t there D. is there
--- What are you doing here, Mrs. White?
---I'm waiting for my son. He________ back from school.
A. hasn't come B. won't come
C. doesn't come D. didn’t come
