21.　　 It was many years before he realized that everyone, strong or weak, rich or poor, should be respected as long as he had made contribution(s) to the society.

20.　　 There is no doubt that China’s rise sharply is the top news in the past decade when wars, economic and natural disasters happened/occurred frequently.

19.　　 I find/ have found (that) what matters is not how much/ how many things you have done in one day, but how well you do those things (which/ that) you have managed to complete/ how well you have dealt with what you have tried to/managed to finish.

18.　　 Whatever/However things/that may be, modern life makes it necessary for each of you to know how to use scientific methods to find the truth.

17.　　 There are so few seats in the hall that quite a lot of persons have to stand for the lecture. 　卢湾

5. In my opinion, the wider range/scope of knowledge you have, the more capable you are of dealing with the problems you have met at work.

4. As negotiating parties only care about their own interests and hold different opinions on the duties they should take (respectively), so far no final agreement on the issue has been reached.

3. He is devoted to his research and takes no notice of what is happening outside.

2. In order to keep fit, I try to set aside some time each day to do physical exercise.

/ To keep fit, I try to set aside some time to do exercise every day.

1. As (was) expected, the representatives (present) at the meeting　

As we had expected,　　　　　 ……who attended the meeting

..…. attending the meeting

offered / provided many suggestions / advice on solving this tough problem.