__________________________________________

11. 对未来有乐观的态度___________________________________________

12. 寻找新的世界___________________________________________________

13. 帮助发现行星_______________________________________________-

14. 凝固_______________________________________________

15. 有可能_______________________________________________

Part 3 Complete the following sentences according to the texts.

1. Think about how many changes ___________ ___________ ___________ in the past one thousand years.

2. I have to constantly rub my eyes to ___________ ___________ ___________ I have traveled to the year AD 3005.

3. ___________ ___________ the journey, I was unsettled for the first few days.

4. As a result, I ___________ ___________ "time lag".

5. This ___________ ___________ ___________ the "jet lag" you get when ___________.

6. ___________ ___________ ___________ their expertise, his parents'