81.(　 ) A: I’m sorry I stepped out for a smoke, I was tired.

B: There is no______ for this while you are on duty.

A. reason　　　　 B. cause　　　　 C. time　　　 D. excuse

80.(　 ) Your homework is all right, _____, you can do it better, in my opinion.

A. but　　　　　 B. besides　　　 C. while　　　 D. however

79.(　 ) A: Why did you go back to the shop?　 B: I left my friends ______ here.

A. to wait　　　　 　B. waiting　　　 C. wait　　　 D. waited

78.(　 ) The pictures I took in Dalian ______ me of the time when I stayed there.

A. remembers　　 B. tells　　　 　　C. says　　　　 D. reminds

77.(　 ) He has been ill for several weeks, so he has ______ in learning Maths.

A. many difficulties　 B. some difficulty　 C. a lot of troubles　 D. a trouble

76.(　 ) Modest men are never ______ of the progress they have made.

A. proud　　　　 B. afraid　　　　 C. certain　　　　 D. thinking

75.(　 ) Digital cameras are becoming more and more popular, but some still __ too much.

　　 A. pay　　　　　 B. spend　　　　　 C. take　　　 D. cost

74.(　 )The dinner didn’t start ______ all the friends arrived.

　　 A. when　　　　 B. while　　　　　 C. until　　　 D. whether

73.(　 )The room is safe to ______.

　　 A. live in　　　　 B. live at　　　　 C. live　　　　 D. live with

72.(　 ) Jane’s birthday is on _____, she loves to take care of others.

　　 A. 23rd August　　 B. 1st September　　 C. 2nd July　　 D. 2nd June