4. goes down　　　　 5. all kinds of 　　　　　 　　　　6. be able to

5. much → many 　　　　 6. sight → sights

4. are swimming → were swimming

3. because → because of

2. loud and loud → louder and louder

6. were watching 　 7. doesn’t rain　 8. studies 　　　　　　　　 9. has been　　　 10. is playing

6. Tomorrow Mr Brown will be busy and won’t 　　　　　　　　　　　(能) come.

Unit 3

5. When spring comes, you can see 　　　　　　　　　　　(各种各样) flowers in that park.

4. When the sun　 　　　　　　　　　　　　(落山), it will get dark.

3. The manager　　　　　　　　　　　 　(在开会) and can’t answer your call now.