1. 单词拼写(根据中文提示拼写单词)。

1. （1） (安全) must always come first. Please keep it in your mind.

3. （2） -- Where are you going for your (假期)?

   -- I'm going to visit Mount Huang.

5. （3） Being tall gives him an (优势) over the other basketball players.

7. （4） We should take actions to prevent water (污染) because people can't live without water.

9. （5） In the famous competition, (获胜者) always get very good prize.