8. There is a big underground railway　　　　 (系统) in London, which is good for travelers.

7. By the time they reached the top of the mountain, they were　　　　 (精疲力尽).

6. You will　　　　　 (逐渐地) get used to the weather here.

5. One cannot e　　　　 without air.

4. The illness is s　　　　　 through the village.

3. Every night he observes the space through a t　　　　　 .

2. With the d　　　　　　 of economy, people’s living standards are higher now.

1. There is too much　　　　　 (暴力) on TV.