用所给动词的适当形式填空 .
1. I am against _____ (build) a new zoo in our city.
2. Don't worry.  All the little tigers _____ (take) good care of in the zoo.
3. _____ (collect) waste paper and bottles in the park is our duty.
4. We saw your brother _____ (throw) rubbish here just now.
5. We _____ (visit) a lot of famous zoos in the world so far.
6.         _ (not spit) everywhere.  You must keep the environment clean.
7. Some animals _____ (keep) in the zoo. I think it is not good for them.
8.  We find zoos are not suitableplace for animals _____ (live) in.
9. Many animals are only _____ (give) food once a day.
10. If we don't support our zoo, they _____ (have) enough money to take care of so many fine animals.