1. 根据汉语提示翻译句子，每空一词，含缩写词。

1. （1） We should all   （尽我们的职责） in classroom cleaning.

3. （2） You may go now. I   （不介意等）here for another twenty minutes.

5. （3）     （没有必要）for us to waste so much time on it.

7. （4） We went to the shop.   （结果）, the shop was already closed.

9. （5）    (不够安全) to travel in the mountain with only water and food.