The police ________ early on foot in order to find the truth behind the mystery.
A.cut out B.found out C.set out D.blew out
There ________ no mountain on the earth that can grow taller than Qomolangma.
A.be B.am C.is D.are
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
