单项选择题
— Why does he look sad?—There are so many problems（）
A.remaining to settle B.remained settling C.remaining to be settled D.remained to besettled
单项选择题 — The physics exam is not difficult, is it?—（）Even Harry to the top students failed in it.
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.
