Some of you may have finished unit one．________, you can go on to unit two．
A．If you may B．If you do C If not D．If so
Not until he left his home __________ to know how important the family was for him．
A．did he begin B．had he begun C．he began D．he had begun
The reason __________ he explained is not __________ I expected．
A．why; that B．why; what C．that ;what D．that; that
--- Do you enjoy your present job?
--- _________．I just do it for a living．
A．Of course． B．Not really C．Not likely D．Not a little
Everyone in our class was working hard and doing what we could _______ a good university．
A．enter B．to enter C．entering D．entered
It rained heavily in the south, ___________ serious flooding in several provinces．
A．caused B．having caused C．to cause D．causing
