79. Recent changes are expected to lead to an overall improvement in the quality of the country's education.

80. Soil pollution is reported to have posed a serious threat to the livelihood of many local farmers.

81. The new regulations are thought to encourage lower consumption of energy. 

82. Has the window of the laboratory been changed?

83. It is believed that 13 is an unlucky number./13 is believed to be an unlucky number.

84. It was rumoured that the man was still living in London.

85. It was declared that she won the competition.

86. English is known to be an international language.

87. It is thought that Jack London’s life and writings represent the American love of adventure.

88. John is said to be the brightest student in class.

89. The President was reported to have suffered a heart attack.

90. He is thought to have died a natural death.