用所给动词的适当形式填空。

l. When I was crossing the street yesterday, I saw an  old man _____ (lie) on the street.

2. He is doing his best _____  ( learn)  how  to swim.

3. All the Chinese people were _____(exciet) when they knew Xu Haifeng won a gold medal in shooting.

4. The teacher told us such _____ (amaze) news that some of us didn't believe it.

5. My younger brother is able_____ ( do)  the  work all by himself.