14.Martin visited his aunt two days before he ________ town.

　　A.left

　　B.will leave

　　C.had left

　　D.is going to leave

　　15.The new suspension bridge _________ by the end of last month.

　　A.has been designed

　　B.had been designed

　　C.was designed

　　D.would be designed

　　16.In 1960, this was the longest bridge that________.

　　A.was ever built

　　B.had ever built

　　C.has ever been built

　　D.had ever been built

　　17.By the time we got there, the play __________ .

　　A.is going to begin

　　B.is just beginning

　　C.has already begun

　　D.had already begun

　　18.Shirley ___________ a book about China last year but I don’t know whether she has finished it.

　　A.has written

　　B.wrote

　　C.had written

　　D.was writing

　　19.A new cinema ________here. They hope to finish it next month.

　　A.will be built

　　B.is built

　　C.has been built

　　D.is being built

　　20.Professor Williams told us that by the end of this year he ________here for two years.

　　A.will have worked

　　B.will have been working

　　C.would have been working

　　D.has been working

　　21.He________for six years by the time he takes his examination.

　　A.had been studying English

　　B.will have been studying English

　　C.studied English

　　D.studies English

　　22.One of the guards _______ when the general came in, which made him very angry.

　　A.has slept

　　B.were sleeping

　　C.slept

　　D.was sleeping

　　23.They will go home for winter vacation as soon as they ______ their exams.

　　A.have finished

　　B.finish

　　C.will finish

　　D.will have finished

　　24.About the sixth century A.D. when few Europeans could read, the Chinese ______ paper.

　　A.invented

　　B.had invented

　　C.have invented

　　D.had been invented

　　25.English ______ in a new way at my college in the past few years.

　　A.has been teaching

　　B.was being taught

　　C.has been taught

　　D.had been taught