题目内容：

用方框中所给单词的适当形式填空。每词限用一次。

actor  protect   twenty   far   hard

1.We need to ______ the wild animals.

2.The little girl wants to be a/an _______ in the future.

3.Sam often gets good grades because he works _________.

4.Today is her _________ birthday.

5.I live _________ from school in our class so I take a bus to school.