58. You might fall if you are not careful.
→Be 

57. We should ban the use of pesticides, but we should also restrict
the use of other chemicals.
→In addition to

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)