29. Salespeople here are paid on a commission basis; however, continued employment is based on their ability to sell service contracts rather than ( )

50、I was very much put ( ) by Mark's rude behavior; it really annoyed me.

49、My mother can't get ( ) because she has rheumatism(风湿病).

48、There ( ) nothing more for discussion, the meeting came to an end half an hour earlier.

47、Do help yourself to some fruit,( ) you?

46、The central provinces have floods in some years, and ( ).

45、This is an illness that can result in total blindness ( ) left untreated.

44、Acute hearing helps most animals sense the approach of thunderstorms long before people ( ).

68、As a developing country, we must keep( )with the rapid development of the world economy.

67、The police let him go, because they didn't find him guilty( )the murder.

66、The guest team was beaten by the host team 2( )4 in last year's CFA Cup Final.