To finish the homework, he spent four hours _______ in the study.
| A．locking | B．locked | C．locked himself | D．to lock |
—Could you please lead your car to me this Sunday?
—_________you have it cleaned after using it.
| A．Although | B．So long as | C．Even if | D．As soon as |
．—We flew to Egypt for the holiday and we all had a wonderful time.
—_________.
| A．Oh, that’s very nice of you | B．Congratulations to you |
| C．Oh, I’m glad to hear that | D．It’s a pleasure |
Studying abroad, the boy was exposed to a way of life_________he was not at all fanmiliar.
| A．with which | B．to which | C．for which | D．of which |
With everyone’s face_________behind the mask, it’s hard to tell who they really are.
| A．having hidden | B．being hidden | C．hidden | D．hiding |
．Why must I apologize to him? I am in no way_________for the quarrel, after all.
| A．blamed | B．to blame | C．to be blamed | D．being blamed |