EL Capitan, about 3,000 feet high, is one of the world’s ________ mountains to climb.
A.hard B.harder C.hardest D.the hardest
My dad ________ at least 10,000 steps every day.
A.walks B.is walking C.will walk D.has walked
Things ________ much easier if we work in groups.
A.be B.were C.will be D.have been
— ________ camera is this, Lingling?
—I think it's Tony's. He was taking photos here just now.
A.What B.Where C.How D.Whose
Today's online class will start ________ 7:30 a.m. Are you ready?
A.at B.on C.in D.of
Tony, could you introduce ________ to your new classmates?
A.you B.your C.yours D.yourself
