1 . The main reason ________ monarch butterflies are endangered is ________ lots of places ________ used to be home to them have been seriously destroyed.

A．why; because; where	B．that; because; where
C．why; that; that	D．why; that; where

2 . 他继续这个实验的原因，是因为他希望能成功的完成这项任务。(定语从句)
The reason ___________ was that he was in the hope of completing this task successfully.

3 . One of the most important reasons________ so many people from all over the world come to live in Shanghai is the dream of a better prospect.

A．that

B．which

C．why

D．because

4 . 人们写诗的原因多种多样。(汉译英)

5 . 体育节之所以成功，是因为每个班都在努力训练为这次盛会做准备。(用名词性从句翻译)

6 . The moment you think about giving up, think of ________.   
你想放弃的时候，想想你坚持这么长时间的原因。

7 . 这部电视连续剧受年轻父母欢迎的原因是他们很容易与剧中的人物产生共鸣。（identify）（汉译英）

8 . The reason ___________ you gave an account of is not believable, so I am still feeling curious about the reason ___________ you were absent from today’s assembly. (用适当的词填空)

9 . 我想采访杨利伟的原因是他对中国的发展做出了巨大贡献。(表语从句)(汉译英)

10 . 选词填空（that/which/when/where/why）
1. I will never forget the days ________ we spent together.
2. Do you remember the day ________ we first met?
3. The reason ________ he explained at the meeting was not sound.
4. The reason ________ he was late was that he missed his bus.
5. The school ________ I studied for only two years was three kilometres away.
6. This is the house ________ was built by my grandfather forty years ago.