12.（单选题）I don’t think the economy in my country will develop very fast in the next ten years.

40.（单选题）More and more people are beginning to learn English, ______ is becoming very popular in China.

39.（单选题）The problem ______ whether he is willing to marry you.

38.（单选题）Do you know the student ______ I often talk with?

37.（单选题）Jacky is an _______ scholar who published several important papers last year.

36.（单选题）We should focus on _______ in learning English.

35.（单选题）College students can make their choices ____________ in many things.

34.（单选题）Most governments realize that national economies aren’t ___________ of each other.

33.（单选题）Steven planned to carry on a small amount of _________ with his friends.

32.（单选题）They have offices in the ___________ heart of the city.

31.（单选题）Everyone should _______ his/her duty to help the company.