用所给单词的适当形式完成句子。

1. More and more _____ (danger) animals need to be protected by us.

2. Don't worry.  We _____ (support) you when you have the match.

3. _____ (recycle) paper to save trees is very important.

4. Your house is very old.  It should be _____ (pull) down.

5. Why are you _____ (wear) a coat in such hot day?