Gun control is a subject __________ Americans have argued for a long time.
| A．of which | B．with which |
| C．about which | D．into which |
Miss Li ______ as a secretary for five years in the company，and now she is general manager of it.
| A．serves | B．served |
| C．had served | D．has served |
A warm thought suddenly came to me _______ I might buy some flowers for my friend's mother’s 60th birthday.
| A．if | B．when | C．that | D．which |
Though a typhoon is on the way，people are still looking forward _________ the outdoor concert.
| A．to canceling | B．not to canceling |
| C．not to cancel | D．to not canceling |
－Mary，how did your Math test go?
－I had thought I _________，but in fact I came in the top 10 in my class.
| A．should have failed |
| B．couldn’t have failed |
| C．have failed |
| D．shouldn’t have failed |
Rome was not built in a day．You should set ___________ goals and work hard to achieve them.
| A．alternative | B．considerable |
| C．subjective | D．realistic |