－I'm afraid that I couldn't pass the examination.

－As a student，you need to believe in yourself________you have the ability to achieve any________goal.

A．knowing；to be set

B．knowing；set

C．known；setting

D．known；to be set

不得使用运输毒性物质的道路危险货物专用车辆运输____。

A.强毒性货物 

B.普通货物 

C.弱毒性货物