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B.an
C.the
D./ 2.Green cars are good for the environment, so Mr. Smith wants to buy ____________.
A.it
B.one
C.this
D.that 3.By reading Teahouse, Bill knows more about the changes in Chinese ____________ over fifty years.
A.business
B.society
C.culture
D.education 4.—Jack, you look ____________. What happened —I lost my brother’s new bike.
A.excited
B.surprised
C.worried
D.bored 5.—The book from the library can only be kept for two weeks. —OK, I will ____________ it on time.
A.post
B.order
C.return
D.recycle 6.Every Sunday, Tony volunteers to collect litter in the park ____________ bad weather stops him.
A.if
B.when
C.or
D.unless 7.Now people like to use WeChat Pay ____________ cash because it’s quick
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