根据句意拼写单词，或用所给词的适当形式填空。

1. We should learn to _____ (结合) work with pleasure.

2. A pigeon is the _____ (象征) of peace.

3. Can you guess the answers to these _____ (谜语)?

4. My sister is good at _____ (打字).

5. The dustman collects lots of _____ (垃圾) every day.

6. People use ICQ to have _____ (联机的) conversation with friends.

7. I _____ (normal) get up at six in the morning.  

8. We must _____ (seek) a solution to the problem.

9. E-mail English is a new kind of _____ (write) English that is very popular among the young people.

10. I want to know _____ (who) books they are.