40. The teacher was angry about his being late for class, but he behaved ______ nothing had happened.

　 A. as　　　　　 　　B. even if　　　　　　 C. as if　　　　 　　D. even though

39. Candidates ______ remain in their seats until all the papers have been collected.

　 A. must　　 　　　　B. shall　　　 　　　　C. may　　　 　　　　D. can

38. -Excuse me, Dad, but I’m going to the club to meet my friends in the football team.

　 -OK. ______

　 A. Have fun　　　　 B. Congratulations　　　 C. With pleasure　　　 D. Gook luck