3.　　 It is a pity that some people do not know the importance of time.

2.　　 We should form the good habit of saving time. Do not put off what can be done today until tomorrow.

1.　　 We should make full use of our time to do useful things.

17.　 We should take good care of the forest and plant more trees instead of cutting down so as to improve our living conditions.

人生信条、人口人权

16.　 To protect ourselves, we must keep the balance of nature.

15.　 Only in this way can we enjoy fresh air and live a healthy life.

14.　 Only by this means can we stop the air from being polluted.

13.　 Thus more effective measures should be taken immediately to protect wild animals.

12.　 It is generally agreed that civilized people should love and protect wild animals.

11.　 It is glorious to take care of the environments while it is shameful to pollute them.