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1、Book3 Unit21. a healthy dietgo/be on a diet2. balance n.&v.balanced adj.keep a balanced diet3. ought to do = should do ought to have done =should have done4. Nothing could be better.否定词+比较级=最高级No one could do it better than Jane.5. lose weightput on weight6. curiosity n.meet/satisfy ones curiositysh
2、ow curiosity about sth.curious adj.be curious aboutbe curious to do Its curious that curiously adv.7. get away with 8. tell lies/ a lie9. keep fit10. win back 11. strength n.build up ones strengthstrengthen v.12. consult vt.consult for consult sb, about sth.consult withconsultant n.consultation n.13. earn ones living14. look forward to (doing) sth.15. in debt16. glare at 17. spy on18. benefit v.&n.benefit from/bybenefit sb./sth.be of (much/great) benefit to sb = be beneficial to sb.beneficial adj.19. combine and/with 20. cut down21. before longlong before