They _________ the plane, or perhaps they have been prevented from coming for some reason.
| A．can have missed | B．can have lost | C．may have missed | D．may have lost |
No one can stop him,the boy is determined to do something.
| A．even if | B．once | C．now that | D．although |
Only after the woman had her own childhow difficult it was to be a mother.
| A．did she realize | B．she had realized | C．she realized | D．had she realized |
You mayyour teachers for help when you have problems.
| A．turn up | B．turn down | C．turn to | D．turn off |
No one can prevent the plansout.
| A．to be carried | B．from carrying | C．not to carry | D．from being carried |
One of the men held the viewthe book said was right.
| A．that | B．what that | C．that what | D．whether |