单项选择题
（）the government agrees to give extra money, the theatre will have to be closed next.
A. Unless B. If C. Since D. As
单项选择题 There are 500（）students and 300（）teachers in this school.
单项选择题 It's believed that（） you work, result you'll get.
单项选择题 How ()will you be able to finish the painting In a couple of hours.
