I.用所给单词的适当形式填空。（共10分）
1.Who first (discover)America.
2. He ______(explain) that he had been cheated.(受骗)
3.This girl got_________(interest) in music when she was five years old.
4.Can you see liquid water ______(come) out of the tap or ____(run) in a river.
5.I have finished______(do) my homework,have you finished yours?
