翻译以下短语并完成句子。
1. watch for _____
2. watch out ( for)____
3. He is  _____  a better chance. 他正在等待更好的机会.
4. Will you____my clothes while I have a swim?
     我去游泳,你帮我看一下衣服好吗?
5. It's fantastic to swim in the sea, but you have to ____ sharks.
     在海里游泳真是太爽了,但是,你必须要小心鲨鱼.