13. The printer used the highest quality paper and ink and turned out far fewer volumes than he otherwise ( )

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.

65、The local authorities realized the need to make( )for elderly people in their housing programmes.

64、The chairman of the company said that new techniques had( )improved their production efficiency.

63、The fact that the management is trying to reach agreement( )five separate unions has led to long negotiations.

62、We should always bear in mind that( )decisions often result in serious consequences.