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I．用适当语法形式或词汇填空。从A、B、C和D四个选项中选出一个最佳答案，并将答案的相应字母填在答题纸上。
1.They will tell you all you want to know.They’ll give you plenty of____________.
A.information B.messages
C.suggestion D.news
2.No one can well understand this book ____________ he knows the cultural background.
A.if B.when
C.unless D.although
3.They were playing basketball while I ____________my homework.
A.did B.had been doing
C.had done D.was doing
4.He enjoys____________ to various parties,but he seldom goes to one.
A.to be invited B.being invited
C.inviting D.to be inviting
5.____________the station earlier,you would not have missed the train.
A.If you reach B.If you reached
C.If you have reached D.If you had reached