题目内容：

    Our teacher work very hard. They get up early in the morning and work very（A）______. How to help our teacher ?

First, we must try to （B）learn our subjects well to make our teachers spend less time on us and let them have more rest.

Second, we must clean the blackboard and the teacher’s desk very （C）______. If we can do so, our teachers will work better and of course they will be happier.

Our teachers often have to speak for a long time and they are very tired. At this time, （D）it is better for us to bring them some water. When our teachers drink the water, they will speak （E）more clearly. After our teachers correct our exercise books, we can help to hand them out.

We all know that our teachers care about our marks（分数）most, so we should try to go over our lessons to get high grades. If all of us can get high marks, （F）我们的老师会感到很高兴。

1.在文中（A）和（C）的空白处填入适当的单词：____________________ ____________

2.写出文中画线部分（B）和（E）的同义词或近义词：_____________ ____________

3.文中画线部分（D）指代的是：_________________________________________________

4.将画线部分（F）译为英语：__________________________________________________

5.找出本文的中心语句：_____________________________________________________