$18.B$

$19.D$

$20.C$

$21.D$

$22.D$

$23.D$

$24.B$

$25.D$

$26.A$

$27.C$

$28.A$ 

$29.B$

$30.D$

$31.D$

$32.B$

$33.A$

$34.C$

$35.C$

$36.A$

$37.A$

$38.D$

$39.D$

$40.C$

$41.B$

$42.B$

$43.A$

$44.D$

$45.A$

$46.C$

$47.A$ 

18. B belly

go belly up : phá sản

19. stands

It stands to reason that : rõ ràng là

20. C erased : tẩy, xóa

21. D relax : thư giãn

22. D married

23. D sad and impatient

24. B I don't quite agree

25. D Would you like a cup of coffee

26. A which

27. C threatened

threat to do sth: đe dọa làm gì

28. A attributable for sth : gây ra, đưa ra

29. B However

30. D other

---

31. D Keep clearly defined working hours

32. B responsible

33. A easier

34. C Take a rest and come back tomorrow

35. C people

---

36. A Knowledge of obesity

37. A people

38. D 93%

39. D the lowest mortality

40. C preserving

41. B superlative : tối ưu

42. B Among those who were overweight, smoking increases mortality

43. A - had held

44. D - its work

45. A - couldn't bear

46. C It's hours since Jane rangs

47. A My friend advised me not to ask him for help