选适当的短语填空，使句子意思完整。(5’)

小题1:These coats _______ wool and cotton.

小题2:Can you _______ a better idea than this?

小题3: Be careful! Don’t play with the knife. You may__________.

小题4: Don’t worry. I______not________you, I will be all right soon.

小题5: I will leave for a few minutes, would you please ________ my baby?

1________2_________3________4_________5__________

麻花钻的材质是（）

A.合金钢

B.硬质合金

C.高速工具钢

D.半硬质合金钢