根据句意和首字母提示补全单词。
1. What's the matter with Liu Yang? She h________ her arm in a traffic accident.
2. If you don't want to d _________ earlier, you should obey the traffic rules.
3. Students must obey all the rules of their s_________.
4. Be careful when you c_________ the street.
5. Don't speak too f_________, or I can't hear you clearly (清晰地).