7. 越来越贵
6. 进行鸟类统计
5. 促使他们采取行动来保护天鹅
4. 长尾巴的海鸥
3. 为…腾出空间
2. 终年
1. 东北
14. If I_____(be) free, I _______ (write) to you.
课后反思:
13. If it _________ (not rain) in 2 hours, we __________(leave) for Shanghai.
12. _____ Simon_____ (join) the Birdwatching Club? Yes, he_____.