单项选择题
— Do you think I could borrow your calculator? —（）
A.Yes, help yourself. B.It doesn’t matter. C.Yes, you may borrow. D.Yes, go on.
单项选择题 Don't disturb me. I（）letters all morning and have written ten so far.
单项选择题 Mr. Smith（）a most important part in the development of our city.
单项选择题 Could you tell me where Mr. Lake is? ---（）
