Our memories can ________ or even forgotten completely.
A.change B.changed C.are changing D.be changed
Wu Dajing broke his own record and _______the gold medal（奖牌）in the men's 500-meter race.
A.win B.won C.winning D.wins
A friend of ________ named Paul received a new bicycle from his brother as a Christmas gift.
A.I B.my C.mine D.myself
If you live in Changchun, you may notice that the air in winter is not as _______as it is during the summer.
A.clean B.cleaner C.cleanest D.cleaning
—I forgot to bring my notebook here. Could you please lend me two________, Linda?
—OK, here you are.
A.paper B.papers C.piece of paper D.pieces of paper
Knowledge can make________ difference in our life and change the world.
A.a B.an C.the D./
