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 has begun |
Linda _____________ at home now, but I’m not sure. Why not have a try?
A must be B might have been C may have been D might be
The doctor is not quite sure about what ________ the head injury will have on the patient. It may even cause brain damage.
A affect B effect C affection D effective
Interest, as well as prospects(前景)， important when one looks for a job.
A are B were C is D was
It is generally considered unwise to give a child _____he or she wants.
A however B whatever C whichever D whenever
The number of traffic accidents that _______ in developing countries _______ increasing.
| A．happen; is | B．happens; is | C．happens; are | D．happen; are |