7. Most of us have ___________ the question of what makes life meaningful.

6. The US has threatened to ____________ economic and military aid.

5. Friends and neighbors joined police officers to ____________ clues.

4. Danny Aiello _________ this comedy about New York’s first big lottery winner.

3. He was a strong, vital man, successful and _________ his life.

2. The little boy ran for the football and _________ a man standing there.

1. What does all this __________ in the third sentence?

3. Do you find it funny to see someone sliding on a banana skin?你看到有人被香蕉皮滑倒会觉得可笑吗?

句中it是形式宾语，真正的宾语是不定式to see someone sliding on a banana skin，其中sliding on a banana skin是动词-ing作宾语补足语.所以本句包括两个结构：

(1)find it+adj.+to do sth. 觉得做……很……

I find it difficult to understand him.

(2)see sb. /sth. doing sth.看见某人做某事

Can you smell anything burning?

I heard Mr. Smith singing in the next door.

考点例题：

It is pretty well understood __________ controls the flow of carbon dioxide in and out the atmosphere today.

A. that　　 　　　　　 B. when　 　　　　　 C. what　 　　　　　　 D. how

I hate ______ when people speak with mouthful.

A. it　 　　　　　　　　 B. that　　 　　　　　　 C. because　 　　　　　 D. for

[模拟试题]

2. Using his hybrid rice framers are producing harvests twice as large as before.用他的杂交水稻种子，农民种出比以前多一倍的粮食。

倍数表达法：

(1)A+be+倍数+as+adj.+as+B

Asia is four times as large as Europe.

(2)A+be+倍数+比较级+than+B：

Asia is three times larger than Europe.

(3)A+be+倍数+(由某些形容词变化来的)名词+of+B

Asia is four times the size of Europe.

考点例题：

The meeting room is __________________________________________(四倍大)as our classroom.

1. Wishing for things, however, cost nothing.然而，愿望是不花本钱的。

wishing for things为动词的-ing形式做主语.动词的-ing形式由动词原形+ing构成，如：

Collecting information is very important to businessmen.

Learning a foreign language is very useful to me.

to do 也可以作主语，但是表示一个具体的特定的动作，而doing更强调一个抽象的平常的动作。

________________________ basketball is very popular with boys in our school.

________________________ basketball is what I want to do this afternoon.