A.so B.therefore C.since D.as
单项选择题It's not safe()in the street.
A.played B.play C.playing D.plays
单项选择题He()himself quickly to the new condition of his work.
A.changed B.altered C.adjusted D.varied
单项选择题I have spent a lot of time()working on this problem.
A.at B.–(不填) C.on D.with
单项选择题She likes to spend time()with her grandchildren.
A.play B.to play C.playing D.played
单项选择题China is()the east of Asia.
A.in B.to C.on D.at
单项选择题That place is()the south of the city.
A.at B.in C.on D.to
单项选择题I'm tired. I()working very hard.
A.have B.am C.had D.have been
单项选择题They()for hours.
A.have been driving B.have been driven C.drove D.drive
单项选择题He has()four successful books.
A.wrote B.written C.been writing
单项选择题We have our house()every week by a cleaner.
A.clean B.cleaned C.cleaning D.to clean