56. We must do something about the problem even if it costs a lot.
→Costly 

55. May I borrow your pen?
→Would

54. Why isn’t this TV working?

what.....

53. Local residents said they were against the new traffic scheme.
(DISAPPROVAL)

52. I don’t personally care if they come or not. (MATTER)

51. If interest rates are cut, the economic situation may improve.
(REDUCTION)

50. The teachers agreed to introduce the new methods.
(AGREEMENT)
 

49. I daren’t turn on the television because the baby might wake
up. (FEAR)
 

48. There are a lot of people depend on him.
→He 

47. Provided your handwriting is legible, the examiners will accept
your paper.
→So long