15．I didn’t see your sister at the meeting. If she _______, she would have met my brother.
| A．has come | B．did come | C．came | D．had come |
.She reached the top the hill and stopped ______on a big rock by the side of the path.
| A．to have rested | B．resting | C．to rest | D．rest |
Tom kept quiet about the accident ___lose his job.
| A．so not as to | B．so as not to | C．so as to not | D．not so as to |
.-Shall we go skating or stay at home?
-Which _______do yourself?
| A．do you rather | B．would you rather | C．will you rather | D．should you rather |
It is foolish ______such a mistake.
| A．for me to make | B．for me making | C．of me to make | D．of me making |
I don’t think it advisable_______.
| A．your studying math | B．you to study math | C．for you to study math | D．of you to study math. |