A. We can see clearly from the top of the building it i……

单项选择题--Tim, what are you looking at ? ---Sorry , Mr. Smith. I ___ out at a bird outside the window. A.looked B.am looking C.have been looking D.was looking

单项选择题---Do you work hard at your lessons? ---Yes, I no efforts. A.spend B.spare C.waste D.share

单项选择题－－－What's the matter with Jane? She has been sitti

单项选择题>You never get over being a child, ______ you have a mother to go to.A.as far as B.unless C.so long as D.although

单项选择题Lianzhan said that people in Taiwan and Mainland must try hard to understand each other, and ______ misunderstanding.

单项选择题_______ of us is perfect; we all may make mistakes. Both B.None C.Neither D.All 

单项选择题-- Has Mary finished writing her article?-- No, and it _____ before class was over.A.should be finished B.should finish C.should have finished D.ought to have been finished

单项选择题Only after the second tower of the World Trade Centre did people know it was not an accident, but an attack of some kinD. A.had hit B.did fall C.was hit D.was fallen 

单项选择题__ , she knew she'd never been there beforE.

单项选择题We were just about to leave_______ it started to snow.A.when B.before C.after D.since