You are not allowed to take a bus _________ you wear a mask (口罩).
A.unless B.when C.if D.because
The delivery man promised that he ________ my takeout(外卖) very soon.
A.will deliver B.would deliver C.are delivering D.were delivering
Zhang Wenhong ________ as a doctor in Huashan Hospital since he graduated from college.
A.works B.worked C.has worked D.is working
Underground lines make people go out ________ than before.
A.convenient B.conveniently C.more conveniently D.most conveniently
China has become one of ________ countries worldwide in greening the desert.
A.more successful B.the most successful C.more successfully D.most successfully
She thought she heard ________ fall on the floor, so she got up to take a look.
A.everything B.nothing C.anything D.something
