根据句意及首字母的提示，补全单词。

1. Jim h_____ his knee when he played basketball.

2. I f_____ off the bike and had a pain in my leg.

3. —What is the m_____ with your finger?

    —I cut it by accident.

4. I had p_____ seeing the blackboard. Maybe I am short-sighted.

5. I saw an a_____ on my way here.  A car hit a bus.