1.The staff of the company are always courteous and helpful.

　　A)efficient

　　B)respectable

　　C)well-informed

　　D)respectful.

　　2.The new job will provide you with invaluable experience.

　　A)simply useless

　　B)really practical

　　C)very little

　　D)extremely useful.

　　3.The whole idea to build a deluxe hotel here sounds insane to me.

　　A)reasonable

　　B)sensible

　　C)crazy

　　D)unbelievable

　　4.In his two-hour-long lecture he made an exhaustive analysis of the issue。

　　A) extremely thorough

　　B) long and boring

　　C)superficial

　　D)unconvincing

　　5.We all think that the new device he has proposed is ingenious

　　A) effective

　　B)clever

　　C)implausible

　　D)original