I have created these sentences to give you a chance to         the world of English vocabulary and its hidden beauty.

A．select

B．replace

C．explore

D．decorate

使用硬质合金可转位刀具，必须选择( )。

A．合适的刀杆

B．合适的刀片

C．合理的刀具角度

D．合适的切削用量