He is only too ready to help others, seldom, ____, refusing them when they turn to him.
| A．if never | B．if ever | C．if not | D．if any |
___ she couldn’t understand was ___fewer and fewer students showed interest in her lessons.
| A．What; why | B．That; what | C．What; because | D．Why; that |
—-I can't stand you! I'm leaving.
—________. See if I care.
| A． No problem | B．Come on | C．No doubt | D．Go ahead |
--- Shall I get one more cake fro you, David?
--- Thanks, but you ______. I’ve had enough.
| A．shouldn’t | B．mustn’t | C．can’t | D．needn’t |
Thank you very much. Without your help we ______ car started.
| A．didn’t get | B．hadn’t got | C．couldn’t get | D．couldn’t have got |
--- Any news about the fire?
--- Nearly 20 people ______ from the burning building by now.
| A．rescued | B．have been rescued | C．have rescued | D．were rescued |