I. Make up the questions:
1. types/of/problems/What/ecological problems /we/do/have?
2. are/seas/Why/the/danger/in?
3. “greenhouse effect”/does/the/What/mean/word?
II. Make up the sentences with the words:
1 .Protect
2. recycle
3. litter
4. rare plants and animals
5. reduce
6. save