10. Scientists have (send) spaceships to the planet of Mars to take photos.

9. 1 can get some (information) on space travel.

7. 1 have just (make) a model ship for my brother.

8. Scientists haven’t (discover) life on Mars.

5. He (be) to the History Museum several times.

6. he (return) it to you?

—Yes,he has.

3. you ever (speak) to a foreigner before?

4. you (borrow) the book before?

—Yes,I   (borrow) it last week.

2. My mother isn’t at home. She (go) to Shanghai.

用所给单词的适当形式填空 (10分)

1. (thousand) of people lost their homes in Japan's earthquake.

15. You should often (交流) with your teachers.

14. We shouldn’t throw rubbish everywhere to protect (环境) .

12. He has already been to the (月球) .

13. Have you heard the latest (消息) ？