80. It is necessary to pay attention to what your parents say.

81. Laura is very proud of having been selected to represent her class at the Reading festival.

84. It was the children that his presence at the meeting frightened.

86. It was a book written by .... that she presented him.

87 It would be a good idea to talk to your parents before ....

88 She is proud of being  the leader of the Englihs club.

91 It was his presence at the meeting that frightened the children.

80. It is necessary for you to pay attention to what your parents say

81. Laura is very proud of having been selected to represent  her class at the Reading Festival

84. It was the children who were frightened at the meeting by his presence

86. It is a book which she presented him written by Mark Twain, a famous American writer onhis birthday

87. It would be necessary for you to talk to your parents before making up your mind

88. She is proud of being the leader of the English club

91. It was his presence at the meeting that frightened the children