单项选择题
Parliament didn't think the Prime Minister did enough in the improvement of fair employment（）he was asked to write to Parliament for further explanation.
A.so B.therefore C.since D.as
单项选择题 It's not safe（）in the street.
单项选择题 He（）himself quickly to the new condition of his work.
单项选择题 I have spent a lot of time（）working on this problem.
