40.I bought a model of the Eiffel Tower as a ________ (纪念品) of my tour to Paris.

39.He gave no ________ (解释) for what he had done that night.

38.The university attracts thousands of students of various ________ (国籍) every year.

37.According to official ________ (统计数据), the H1N1 virus killed over 2,000 people altogether.

36.Xiao Li works very hard. ________ (fortune), he fell ill and missed the final exams.

35.Only a small ________ (minor) of students are interested in studying abroad nowadays.

34.All ________ (fly) have been cancelled because of the heavy fog.

33.The system will have to be tested before it goes into ________ (produce).

32.It was ________ (consider) of you not to play the piano while I was asleep.