根据句意用所给单词的适当形式填空。
1. Noise _____ (pollute) isn't a big problem of our city.
2. It is _____ (please) to go hiking with old friends.
3. She danced _____ (beautiful) at the party yesterday.
4. Don't be afraid of the dog. It is _____ (harm).
5. It's _____ (mean) to help the poor people.
6. —Why won't you see the movie this afternoon?
—Because I _____ (see) it before.
7. When I arrived there, Millie_____ (read) a book.
8. I wish we _____ (will) have enough money to help the poor.
9. It's impossible for him _____ (do) the job alone.
10. Although it's very late, the workers keep _____ (work) hard.
1. pollution 2. pleasant 3. beautifully 4. harmless 5. meaningful 6. have seen 7. was reading
8. would 9. to do 10. working