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����21. It pays to take part in social works in order to know the outside world better.
����22. Listening to music enables us to feel relaxed.
����23. We should bring home to people the value of working hard.
����24. Taking exercise is closely related to health.
����25. The condition of our traffic leaves much to be desired.
����26. ��change the course of history��
������turn over a new leaf��
������shape the destiny of a nation��
������shape the world��
������break a new ground��
����27. Smoking has a great influence on our health.
����28. Pollution poses a great threat to our existence.
����29. We shall do our utmost to change and reverse the current situation.
����30. Time is more than money.
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