81, Our school has nearly 600 students
82. The Everest is the highest mountain in the world
83. Hung has two younger brothers
84. Learning English is very important now
85. Because of his sickness, he couldn't go to school yesterday
86. The white shirt is cheaper than the red one
87. What is the length of this road?
88. It isn't necessary for us to do all the homework today
89. What is the price of the yellow school bag
90. This road will be widened by the end of this year.