4. 他怎样克服的那个坏习惯，谁也不清楚。(get rid of)

3. 说实话，他是个靠得住的人。(depend on)

2. 我们都知道他不诚实而且经常撒谎。(it’s known to sb)

1. 他们是否允许我们离开还没有定下来，所以我们要继续等。(whether)

12. If we don’t hurry up, we won’t be ________ to catch the airplane.

11. I miss my hometown so much that nothing can ________ me ________ going back.

10. On New Year’s Eve we may hear fireworks ________ here and there. We don’t think it noisy but exciting.

9. Explorers have been sent to Mars to make sure whether life ________ on it.

8. If birds want to fly, they have to ________ their wings and wave them up and down.

7. The First World War ________ in 1914 and ended in 1918.