The cost of living in Glasgow is among the lowest in Britain, ________ the quality of life is probably one of the highest.
| A．since | B．when | C．as | D．while |
Mr. Smith，________of the ________speech，started to read a novel.
| A．tired；boring | B．tiring；bored |
| C．tired；bored | D．tiring；boring |
It was not until the teacher had explained it three times _______ how to work out the problem.
| A．did he understand | B．had he understood |
| C．that he understood | D．that he didn’t understood |
Only after my friend came ____.
| A．did the computer repair | B．he repaired the computer |
| C．was the computer repaired | D．the computer was repaired |
Dickson left his father’s firm and ____business on his own.
| A．started out | B．launched into | C．began on | D．worked at |
There is no doubt _______international cooperation is the key to dealing with cyber crime.
| A．then | B．that | C． wheather | D．this |