________he was very tired，he continued working in his office．
| A．Since |
| B．Although |
| C．As soon as |
| D．Because |
—Look, there_____ many birds around here, but now we hardly see them. What a pity!
—Yeah! The air pollution has caused the problem!
| A．are | B．used to have | C．used to be | D．use to be |
—What do you think of the hotel?
—There are no customers in the hotel. It ______ have the friendliest service.
| A．can’t | B．needn’t | C．may | D．must |
—How about going hiking this weekend?
—Sorry. I prefer ______ rather than ______.
| A．staying at home, go out | B．going out; staying at home |
| C．to go out, stay at home | D．to stay at home, go out |
—Here are two rice cards. Which one belongs to ______?
—Look. Here is my name. It must be ____. The other one is yours.
| A．mine;me | B．me;mine | C．me;me | D．mine;mine |
—Have you ever been to New York before?
—No. This is my first ______.
| A．call | B．vacation | C．visit | D．show |