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Exercise 6:Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

51.C. covering

be used for V-ing: được dùng làm gì( chỉ mục đích)

52.C. telling

It's no good + V-ing: Thật vô ích khi làm gì

53.A. not to worry

It's important+ to V

54. D. to do

forget+ to V: quên phải làm gì ≠ forget+ V-ing: quên đã làm gì

55. D.to give

remember+ to V: nhớ phải làm gì ≠ remember+ V-ing: nhớ đã làm gì

56.B. is used to produce( Passive voice)

57.D. to make

S+be+adj+enough+to V: đủ....để làm gì

58.C. playing

59.C. calculate

to+V-inf: chỉ mục đích

60. C. to communicate

61.C. to cook

62.C. to store

63. A. has worked ( present perfect)

64. C. haven't finished (present perfect)

65. A. been

66.D. signed (past simple)

67.C. has stolen

68.D. has gone ( present perfect)

69.A. just: vừa mới

70.C. Have (present perfect)

71.B. have visited(present perfect)

72.A. has returned(present perfect)

73.B. have told(present perfect)

74.A. has seen(present perfect)

75.C. have you known(present perfect)

76.A. has grown(present perfect)

77.B. have been published(passive voice)

78.D. I've just had(present perfect)

Exercise 7: Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions

79.D. to introduce=>introduce

80.B.create=>creating

81.C. answering=>answer

82.B. has seemed=>seems

83.A. produced=>has produced

84.D. prevent=>preventing

85.B. for building=>build

86.D. study=> studying

87.A. to=> for

88.C. changed=>has changed

89.B. since=> for

90.to meet=> to meeting