（ ）53.Dan is interested in taking wildlife photographs and enjoys the kind of programme which gives him a chance to see a professional photographer at work.

23. If we ______ adequate preparations, the conference wouldn’t have been so successful. 

24. Only after my friend came ______.

2.

27. People have heard ______ the President has said, they are waiting to see what he will do.

Conversation 29.

25. I keep the picture where I can see it every day, _____ reminds me of the days in my hometown.

63.我们真希望你昨晚没那么多工作要做,因为我们都知道你肯定会在晚会.上玩得很开心。

57.众所周知，贸易和专门化相辅相成，使我们每个人能使用更多的产品。

64.庆幸的是我们带了地图，要不然我们可能就迷路了。

29. ______ is known to everybody, the moon travels round the earth once every month.

60.如今人们有了更多的闲暇时间，因而对各种服务的需求增长得如此快。