1 . 用because或why填空
1. He did not see the film last night. This is ________ he had to help his little sister with her homework.
2. He had seen the film before. That is ________ he didn’t see it last night.
3. — I feel sick.
— This is ________ you are doing too much work.
4. — He was born here.
— This is ________ he likes this place so much.
5. I had neither a raincoat nor an umbrella. This is ________ I got wet through.

2 . 用所给连词或短语完成下面的句子

as if, because, how, that, what, which, whose, who, whether, why, when, where

1. —What a mess! You are always so lazy!
—I’m not to blame, Mom. I am ________ you have made me.
2. The best moment for the football star was ________ he scored the winning goal.
3. How can he stay so calm? It seems ________ nothing had happened to him.
4. Grandma pointed to the hospital and said, “That’s ________ I was born.”
5. I’m afraid he’s more of a talker than a doer, which is ________ he never finishes anything.
6. What you were not aware of at that moment is ________ close you may be to victory.
7. From space, the earth looks blue. This is ________ about seventy percent of its surface is covered by water.
8. Her doubt is ________ she will be admitted into the company, for her first impression was not so good.
9. All that you should let me know is ________ turn it is to take charge of the project next.
10. All that he is not sure about is ________ of the students chosen will win the speech contest.
11. All that I know is ________ he is not a suspect. His leader can prove that he was not on the spot.
12. Her last question was ________ she could turn to for help in time of emergency.

3 . 选词填空
1. ________ (Where, Who) we shall have the meeting is not known yet.
2. I don’t know ________ (how, that) I can finish my work so soon.
3. ________ (That, Whether) men have learned much from the behavior of animals is rarely new.
4. The fact ________ (why, that) most people believe nuclear war would be madness does not mean that it will not occur.
5. ________ (When, What) will happen is impossible to predict.
6. The teacher asked me ________ (whether, how) or not I finished my work.
7. It is estimated ________ (that, whether) a round trip flight to Mars would take more than a year and a half.
8. We all agree with your suggestion, but the question is ________ (why, who) is to put up the money for the activity.

4 . 选词填空

that, why, whether, what, as, as if, because, when

1. I am not sure ________he will lend me a hand.
2. The trouble is ________I am anxious to telephone Mr Smith but I have lost his number.
3. Things are not always ________they seem to be.
4. I think it is ________you are doing too much.
5. I’m afraid he is more of a talker than a doer, which is ________he never finishes anything.
6. All this happened over twenty years ago, but it is ________it was only yesterday.
7. This is ________I have been looking for.
8. The best moment for the football star was ________he scored the winning goal.

5 . Complete the following ideas by famous scientists with a word or expression that introduced a predicative clause.

as though     because     that     what   whoever     why

1. Research is ________ I’m doing when I don’t know what I’m doing. (Werner von brain)
2. The saddest aspect of life right now is ________science gathers knowledge faster than society gathers wisdom. (Isaac Asimov)
3. An expert can be ________ has made all the mistakes that can be made in a very narrow field. (Niels Bohr)
4. … when different experiments give you the same result, it is no longer subject to your opinion. That’s the good thing about science: It’s true whether or not you believe in it. That’s ________ it works. (Neil deGrasse Tyson)
5. This applied science, which saves work and makes life easier, brings us little happiness. That is ________ we have not yet learnt to make sensible use of it! (Albert Einstein)
6. There are only two ways to live your life. One is ________nothing is a miracle. The other is ________ everything is a miracle. (Albert Einstein)

6 . 根据句意，选择短语填空。

1. ____________serving insects as dishes is common in some parts of the world, to many people, the thought of eating them is rather disgusting（令人不快的）.
2. He was in hospital for six months. He felt____________ he was cut off from the outside world.
3. Tea is the main evening meal, traditionally eaten at 5 o'clock in the evening, ____________the diners（就餐者）are not drinking tea.