用所给单词的适当形式填空。

1. When we got there, all the beautiful birds had            (appear) in the forest.

2. You are very confident to make a____(speak) in front of the whole school.

3. Many children in Tibet can get a good____ (educate) now.

4. More and more schools will be            (build) in our hometown next year.

5. Many countries are paying more attention to the____(pollute) around us.