3.（单选题）Students don＇t change classrooms between periods – instead, the teachers move to different classrooms.

49.（单选题）I didn’t think our meeting was __________—you must have known I would be there.

48.（单选题）The training center offers highly ________ courses for business and professional people.

47.（单选题）I didn’t know his telephone number.____ it, I ____ then.

46.（单选题）She won in the handicraft contest because of her ____________.

45.（单选题）It is impossible to ___________ him to join our party.

44.（单选题）The new president is a talented __________.

43.（单选题）I can’t __________ what my life would be like without my family.

42.（单选题）You need to ___________ a dictionary when you come across new words.

41.（单选题）Fashion is ______ changing.

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