按要求写句子。

1.  Is that a basketball?(变为复数形式)

    ________ ________ ________ ?

2.  He has a tennis racket.  (变为复数形式)

    ________ ________ many tennis________ .

3.  She has a ping-pong bat. (变为一般疑问句，并作肯定回答)

     —________ she________ a ping-pong bat?

     —Yes, ________ ________ .

4.  I have two good friends. (变为一般疑问句，并作否定回答)

    — ________ ________ ________ two good friends?

    —No, ________ ________ .

5. They have a math book,and they have a dictionary. (变为同义句)

    They have a math book________ ________ ________ .

钻床进行钻孔操作时，（）。

A.钻穿前，必须减少走刀量

B.严禁戴手套工作

C.变速时，不能停车

D.钻孔前不用划线