1 . The slow growing lichen (地衣) and mushrooms upon which the reindeer depend for survival are not found in plantations. So, the death of one __________ mean the death of the other, and an uncertain future for an entire people. (用适当的词填空)

3 . This _____ sound crazy but I was on my way to drop some of my mother’s things off at the charity bins. (用适当的词填空)

4 . There’s no such thing as a free lunch.
Things that are offered for free_________ have a hidden cost. (根据句意填空)

5 . 下列各句均有一处错误，请标出并改正。
1. If my brother was here, everything would be all right.
2. If he hadn’t been caught in the storm yesterday, he will not be ill now.
3. Therefore we strongly suggested that similar events are held every year.
4. The answer sheet must cut from the newspaper and sent to China Daily after the deadline.
5. We must found ways to protect our environment.
6. Some people who don’t like to talk much are not necessarily shy; they must just be quiet people.
7. —It’s the office! So you may know eating is not allowed here.
—Oh, sorry.
8. If you made better use of your time, you might have learned more.
9. Eye doctors recommend that a child’s first eye exam was at the age of six months old.
10. It mustn’ t be the vocabulary that caused you the problem in the exercise because you know a lot of words.

6 . — Where are you going for your holidays this summer?
— Well, it’s not been decided. I ______go to the countryside to see my parents.

A．might

B．need

C．can

D．must

7 . —She is supposed to come at night.
Why hasn’t she turned up yet?
—_________?

A．What do you think may have happened to her

B．What do you think is to happen to her

C．Do you think what have happened to her

D．Do you think what may happen to her

9 . — ________ we take the subway to the airport now?
—I think so. The traffic ________ be very heavy at this time of the day.

A．Must, must

B．can, can’t

C．can’t, may