C1 Read the sentences and choose the correct one in each pair. Circle the letters.
1 a Daniel finds it easy to solve this problem.
b Daniel finds that it easy to solve this problem.
2 a It took them about two hours getting to Changsha.
b It took them about two hours to get to Changsha.
3 a It is clever of her to go that way.
b To go that way is clever of her.
4 a He did not think interesting to travel in Nepal.
b He did not think it interesting to travel in Nepal.

1. a；2. b；3. a；4. b

本题考查it作形式主语和形式宾语的用法：
1. “find it + 形容词 + to do sth”是固定结构，it作形式宾语，真正宾语是不定式，b选项多了that，结构错误，故选a。
2. 固定句型“It takes sb some time to do sth”表示“做某事花费某人多长时间”，a选项用getting不符合该句型，故选b。
3. “It is + 形容词 + of sb + to do sth”是常用结构，it作形式主语，不定式作真正主语；b选项将不定式置于句首作主语，虽语法可行但不符合表达习惯，故选a。
4. “think it + 形容词 + to do sth”是固定结构，it作形式宾语，a选项缺少it，结构不完整，故选b。

C2 Rewrite the sentences below with it.
1 Reading this book is very relaxing.

2 To get to the town in time is impossible.

3 Writing this article took him two hours.

4 He thinks that moving such a big sofa is difficult.

5 Supporting the Youth Olympic Games is meaningful.

6 Timmy has got the wrong number. He is careless.

7 Working closely with these UNICEF workers is great for us.

8 She finds that staying at home alone is boring.

9 Completing the project took them more than two months.

1. It is very relaxing to read this book.
2. It is impossible to get to the town in time.
3. It took him two hours to write this article.
4. He thinks it difficult to move such a big sofa.
5. It is meaningful to support the Youth Olympic Games.
6. It is careless of Timmy to have got the wrong number.
7. It is great for us to work closely with these UNICEF workers.
8. She finds it boring to stay at home alone.
9. It took them more than two months to complete the project.

本题考查it作形式主语和形式宾语的用法，通过it替代句中的不定式或动名词短语，避免句子头重脚轻。具体用法如下：1. 不定式/动名词短语作主语时，用“It + be + 形容词/名词 + 不定式/动名词短语”结构，it为形式主语，真正主语后置；2. 谓语动词为think、find等词时，用“主语 + 谓语 + it + 形容词 + 不定式短语”结构，it为形式宾语，真正宾语后置；3. 形容词描述人的品质时，用“It + be + 形容词 + of sb. + 不定式短语”结构。