71. Ho Chi Minh City with the population of over 8 million is bigger than any other cities in Viet Nam.
=> Ho Chi Minh city is the biggest city in Viet Nam with the population of over 8 millions.
72. Angel Falls is over 1,000 feet higher than any other falls in the world.
=> Angel Falls is the highest fall in the world
73. Lake Superior in North America is a freshwater lake; it is larger than any other freshwater lakes in the world.
=> Lake Superior in North America is the largest freshwater lake in the world.
74. Remember to bring the compass: if not we will get lost in the forest.
=> You must bring the compass or we will get lost in the forest.
75. Take a waterproof coat during your trip to Fansipan MounTain because it is rainy there.
=>You should take a waterproof coat during your trip to Fansipan MounTain because it is rainy there.
76. It is very important that you arrive on time at school.
=> You must/should arrive on time at school.
77. It is very dangerous to walk alone after 10 pm in that park.
=> You mustn't / shouldn't walk alone after 10 pm in that park.
78. Taking a boat trip around the islands in Ha Long Bay is the most important thing of the trip.
=> You need to take a boat trip around the islands in Ha Long Bay, it is the most important thing of the trip.
79. Antarctica is colder than any other place in the world.
=> Antarctica is the coldest place in the world.
80. It is wrong of us to write on the walls or tables in our classroom.
=> We shouldn't have written / shouldn't write on the
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