根据汉语或首字母提示填写单词。

1. If we don't take action to protect polar bear, they will be in ______ (危险).

2. Do you want to ______ (加入) the Birdwatching Club?

3. Can you give me the r______ why you were late for school this morning?

4. You can do many things in this park, for e______, going boating.

5. Amy is ______ (感兴趣) in reading French novels.

6. I can hear birds ______ (唱歌) outside the classroom now.

7. There will ______ (有) a basketball match in our school this coming Saturday.

8. Wetlands are very i______ because it can prevent flood.

9. He always tells lies, He is d______.

10. It is i______ for us to succeed without effort.

11. His h______ is collecting stamps.

12. Bob is good at running and he runs f______ in his class.