1 . 从下列所给词组中选用正确的词组并以适当的形式填到句子中，每个词组仅能用一次。

give way                           crack a smile                    pay off                                 (be) worthy of      in turn                                 take off                           cross out                                 due to              concentrate on                    turn down                    make sense                           pick up

1. The environmental challenges are significant, but the efforts made by the Tanzania National Park Authority seem to be ________.
2. Most people find the start of the week so exhausting that we can't even ________ until 11 a.m.
3. She can't remember how many times she ________ before getting her first job as a salesgirl.
4. ________ my homework, I didn't notice they had sat down behind me.
5. About 20 years ago, the practice of hunting tourism ________ because of the interest from photographic lovers.
6. Some Internet buzzwords can only ________ with the context of Internet.
7. The dogs serve to protect humans against pumas, which ________ prevents pumas from being hunted by humans.
8. Your composition will read better if you ________ these words and replace them with fine figures of speech.
9. ________ circumstances beyond our control, the flight to Rome has been cancelled.
10. She was going over to her parents' house ________ some clean clothes for Oskar.

2 . — Who ________ it be that left the door unlocked?
— It might be Mike. He is always forgetting things.

A．could

B．should

C．must

D．might

4 . You'd better put on a heavy coat.Sometimes it________be very cold here at night.
你最好穿上一件厚的大衣，在这里晚上有时很冷。

6 . —Look! There stands a man over there behind the tree.I guess it ________ be Mr.Smith.
—It ________ be him.He has gone to his hometown.He left yesterday.

A．may, can’t	B．can, mustn’t
C．must, may not	D．should, shouldn’t

7 . 下面每个句子都只有一处语言错误。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（^），并在其下面写出该词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下面划一横线，并在该词下面写出修改后的词。
1. Many parents lack of patience to tell their children why they should behave as told.
2. During the Second World War, thousands of people flee the country.
3. He has run out all the money his parents gave him.
4. It is bad manner to talk with your finger pointing at another person.
5. I had told them the reason, which I didn’t attend the meeting.
6. I dare not to go winter swimming alone.
7. In no circumstance should the will of the minority override the will of the majority of people.
8. What might he be doing at this time of night?
9. She insisted that she hear somebody in the house.
10. Anna has theory knowledge of teaching, but no practical experience.

9 . Mr. Wang ________ have thought the car was worth the money paid, or he would not have spent so much money on such an expensive sports car.

A．could

B．shall

C．can

D．must