______ we know, the air quality in the city has improved over the past two years.
| A．That | B．As | C．What | D．It |
—I’ve bought a box of chocolates for our daughter.
—Oh, how good a dad! But she doesn’t like sweet things. ________that?
| A．Don’t you know | B．Haven’t you known |
| C．Didn’t you know | D．Hadn’t you known |
—Look! Someone has spilt coffee on the carpet.
—Well, it ________ me.
| A．isn’t | B．wasn’t | C．hasn’t been | D．hadn’t been |
―Isn’t it hard to drive downtown to work?
—Yes, that’s why I ________ to work by train.
| A．have been going | B．have gone |
| C．was going | D．will have gone |
―Is Paul playing both soccer and tennis for the school?
―He_______. But now he has given up playing tennis.
| A．is | B．has | C．was | D．had |
_____ the watch____and see if something is wrong with it.
| A．Take; apart | B．Take; out | C．Put; apart | D．Put; out |