Elephants have their own way to tell the shape of an object and ________ it is rough or smooth.
| A．不填 | B．whether | C．how | D．Which |
__________ smoking, he would not have got cancer in the lung.
| A．Was he given up | B．Had he given up |
| C．Did he give | D．If he gave up |
—If only I__________ morning exercises regularly earlier!
—Yes. Be quick to join us now.
| A．do | B．did | C．have done | D．had done |
—I've told everyone about it in our class.
—Oh, I'd rather you __________.
| A．don't | B．hadn't | C．couldn't | D．wouldn't |
—I still haven't given him my gift.
—It's time you __________.
| A．do | B．did | C．had | D．would |
But for the help you gave me, I __________ the examinations.
| A．would have passed | B．would pass |
| C．wouldn't have passed | D．wouldn't pass |