9.There __________ to be a lot of manatees fifty years ago..

8.Manatees are about 10 _________ long.

7.He’s ________________ for the job very much.

6.Many tall buildings were __________ in our city a few years ago.

5.It’s harmful for the villagers to eat or drink the ______________ food or water.

4.I was ____________ to find hardly anyone in the zoo.

3.I don’t understand what the teacher says because he speaks too ______________ .

2.Kangaroos are _____________ and chimpanzees are noisy.

1.I’m considering _______________ some waste paper to raise some money for homeless children.

10. Don’t use 　　　　　　　(塑料的)bags.