用所给词的适当形式填空。

1. Jay sang the song ________ (beautiful).

2. The water in the river is _________ (harm). You can drink it without cooking.

3. When I passed the driving test, I thought I was the _________ (luck) person in the world.

4. Danny and Daniel are brothers, and their _________ (wife) are sisters. That's interesting.

5. This dress is very popular this year. Do you know who the ________ (design) is?

6. What do you think about the air _________ (pollute) in your hometown?

7. They stopped _________ (talk) and listened to their teacher.

8. Many people use computers in their _________ (day) lives.