20．This is the first time that we ____ to the Great Wall.

　　 A．comes　　 　　　　 B．have been　　 　 C．came　　 　　　　　 D．had come 　

19．His throat _______ by a scarf (围巾)______ the night air.

A．was stopped… from　　　　　　 　　　 B．was protected… from

C．was prevented … from　　　　　 　　　 D．was stopped … /　

18．_____ two exams to worry about, I have to work really hard this weekend.

　 　 A．Because of　　 　 B．As with　　 　　　 C．With　　　　 　　 D．Besides　

17．______he has limited technical knowledge，the old worker has a lot of experience.

　　 A．Since　　　　　　　　　 B．Unless 　　　　　　　 C．As　　 　　　　　 D．Although

16．We thought there were 35 students in the dining hall , ________, in fact, there were 40.

　 A．while　　 　　　　　 B．whether　　　 　　 C．what　　 　　　　　 D．which

15．It is difficult to imagine his _____________the decision without any consideration.

　　　 A．accept　　　　　　　　 B．accepting　　　　　　 C．to accept 　　　　　 D．accepted

14．His plan was such a good one _____________we all agreed to accept it.

　　　 A．so　　　　　　　　　　　 B．and　　　　　　　　　　 C．that　　　　　　　　　　 D．as

13．It was after he got what he had desired _______ he realized it was not so important.

A．that　　　　　 B．when　　　　 　 C．since　 　　　　　　 D．as　

12．The storm damaged(破坏) many houses and business buildings; 　　　　, it caused 20 deaths.

A．or　　　　　　　　　　　 B．however　 　　　　　 C．after all　 　　　　　 D．besides

11．After the earthquake, the injured were cared　　　　　 in the local hospitals or taken by air to the hospitals in the neighboring cities.

A．of 　　　　　　　　　　 B．for　 　　　　　　　　　 C．after 　　　　　　　　　 D．with