I thanked my Chinese teacher _________ helped me get through the test.
A.which B.what C.who D.where
_________ it was hard to keep up with the online classes, I tried my best to follow them.
A.Whether B.However C.Because D.Although
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
