Smoking, ____ some smokers, might ease their anxiety sometimes, but ____ the addiction caused by their constant practice, it is really hard to give up.
| A．according to; due to | B．according to ;because |
| C．as to; since | D．thanks to;if |
--I can't find Mr. Smith.
--It was in the hotel___________ he stayed.
| A．that | B．where | C．which | D．since |
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
| A．since | B．before | C．after | D．when |
My uncle___________ until he was forty-five.
| A．married | B．didn’t marry |
| C．was not marrying | D．would marry |
--What when I phoned you?
| A．had you done; finished |
| B．were you doing; had just finished |
| C．did you do; had just finished |
| D．were you doing; was finishing |
Sometimes words alone were not enough to _________pupils along the path of knowledge
| A．provide | B．persuade | C．advise | D．cause |