用所给动词的适当形式填空。

l. It's time for you ____(talk) in class.

2. His family was very poor, but he never gave up  ____(study).

3. I didn't go out until it stopped ____(rain).

4. He always practiced ____ (speak) English with others.

5. I believe that I will be able____(catch) up with others.

提高切削速度，增加进给量与切削深度是采用（）方法减少基本时间的。

A.提高切削用量

B.减少加工余量

C.采用多刀切削

D.多件加工