1. Yesterday we had __________ meeting in the meeting-room.

A. a two-hours        B. a two hours              C. a two-hour D. a two-hour’s

2. He may arrive here__________ one__________ three this afternoon.

A. from; to                            B. between; and            C. at; to                 D. from; or

3. –Must you leave here now?

–Yes, I__________. There’s lots of homework for me to do.

A. had better                 B. ought to                   C. should               D. have to

4. He was doing his homework __________ he heard the telephone ringing.

A. before                      B. after                  C. while                       D. when