Ma Yun, head of Alibaba, is one of ________ persons in the world.
A. rich B. richer C.richest D.the richest
There will be ________ jobs for people because some robots will do the same jobs as people.
A. many B.more C.fewer D.fewest
The baby was about 52 centimeters tall _______ birth.
A. in B. at C.on D.for
I can see some children _________ basketball in the playground now.
A.play B.played C.playing D.to play
In summer milk will quickly go bad _________ it is put into a fridge (冰箱).
A.though B.unless C.because D.once
---Your English is so good. Who taught you?
---___________. I learned it all by myself.
A.Somebody B.Everybody C. Nobody D.Anybody
