单项选择题
— The physics exam is not difficult, is it?—（）Even Harry to the top students failed in it.
A.Yes；belongs B.No；belonged C.Yes；belonging D.No；belonging
单项选择题 When the railway is completed, we（）get to town much easily.
单项选择题 You（）buy some reference books when you go to college.
单项选择题 The atmosphere（）certain gases mixed together in definite proportions.
