一、 根据首字母和汉语完成单词
1. 科学家们认为世界上存有生命已有几百万年的历史了。
Scientists _____ ______ there has been life _____ _____ for ______ ______ years.
2. 我们还没有在其他行星上发现生命。
We haven’t ______ _______ on other ______ in the ______.
3. 科学家们已经在宇宙中发现了许多别的星系。
Scientists ______ _______ _______ many other ______ in the _______.
4. 弄清楚宇宙有多大是困难的。
It is hard ______ _______ _______ large the _______ is.
5. 为什么没有人从别的行星上给我们发送信息呢？
Why has ______ _______ _______ other planets _______ us a message?

二、 根据括号内动词的适当形式填空。
1. ---What _____ she ______ ( do ) last Sunday? 
---She ______(listen) to the radio.
2. ---_____you ______(return) the book to the library yet?
---Yes, I _____. I ______(return) it yesterday afternoon. The book ______(be) very interesting.
3. ---Where is my friend? ______you _______ (see) her?
---Yes, I ______ her three minutes ago. But she ______(go) to the post office. I think she ______(be) back soon.
4. What do you think Li Ping_______(do) right now?
5. ---______ you ______ (have) your supper?
---Yes, I have.
6. The girl ______(go) to visit the city if it ______ (not rain) tomorrow.
7. Don’t forget _____ (close) the door when you leave home.
8. The boy tried _____(climb) the tree, but he failed.
9. Many girls are good at ______(make) things.
10. The bus _____ (go) . It left twenty minutes ago.

三、 句型转换。
1. They heard a message from a spacecraft. (用just改为现在完成时态形式)
They _____ just ______ a message from a spacecraft.
2. Have you got a letter from Lucy? (同义句)
Have you ______ ______ Lucy?
3. To understand the problem is very difficult. （用it 作为形式主语）
______ ______ very difficult _______ understand the problem.
4. I came here two days ago. ( 同义句)
I ______ _______ here _______ two days.
5. Her mother has been to Hong Kong several times. （就画线提问）
______ _______ ______ has her mother been to Hong Kong?

四、补全对话。
A: Have you _____ Jim these two days?
B: No, he’s _____ to Japan to see his daughter.
A: Has he ever been there ______?
B: Of course. He lived there before he ______ here.
A: Have you still not _____ a letter from him?
B: Yes, I’ve just ______ a letter _____ him.
A: What ______ he say?
B: He said that he ______ a good time ______ would stay there for three weeks. Then he would come back.