1. 迈克是他们班最聪明的学生之一。    
Mike is one of _____ _____ _____ in their class.
2. 孩子们正在户外举行晚会。  
The children are having a party _____ _____ _____ _____.
3. 我们现在没有时间可浪费。    
We have no time _____ _____ now.
4. 我经常帮助儿子学英语。    
I often help my son _____ _____ English.
5. 我觉得很难解释这些学生打架的原因。    
I found it _____ _____ _____ why the students fought with each other.
6. 照顾好老人是我们的职责。  
_____ _____ our duty_____ _____ _____ _____ the old.