12.C 【解析】由上下文得知，此句用于闡述說明遲到的原因。此處為“because”引導的表語從句，“because”意為“因為”。

　　13.A 【解析】略。

　　14.B 【解析】此處為一介詞提前的定語從句;“have respect for sb.”為固定搭配，意為“尊敬”。

　　15.C 【解析】略。

　　16.B 【解析】prove加賓語從句的用法。“一切都證實了知識來源于實踐”。

　　17.C 【解析】略。

　　18.B 【解析】take sides in意為“參戰”。take part需與介詞in搭配。join常指參加某人的游戲/活動;attend常用來指“上課/參加(會議)/列席”等。

　　19.C 【解析】略。

　　20.B 【解析】略。

　　Ⅱ.Cloze

　　21—25 BACBD26—30 CADBA31—35 BDCDC36—40 ABACD

　　Ⅲ.Reading comprehension

　　41—43 DBC44—47 CBBA48—51 ABBA

　　Ⅳ.Writing

　　My friend will never forget what happened to him yesterday.

　　Towards the evening，he was invited to a dinner.He enjoyed his dinner with his friends，drinking a lot of beers.As a result，he got drunk.He insisted on driving home after the meal，although his friends tried to persuade him not to.

　　A few minutes later，he was winding his way on the street.And then his car ran into a tall tree.Fortunately，he was still alive，though seriously injured.The police came to the scene，and he was taken to hospital.Naturally，he had to stay in hospital for several days.Worse still，his driving license was revoked.How he regretted what he had done!