71 . HCM city is the biggest city in VN

72 . Angel Falls is the highest falls in the world

73 . Lake Superior in North America is the largest freshwater lakes in the world

74 .  You must bring compass

75 . You should take a waterproof coat during your trip to Fansipan Mountain because it is rainy there. 

76 . You need to arrive on time at school

77 . You shouldn't walk alone after 10 pm in that park.

78. You should taking a boat trip around the islands in Ha Long Bay is the most important thing of the trip.

79 . Antarctica is the coldest place in the world

80 . We shouldn't write on the walls or tables in our classroom.

XI.

1,HCM city is the biggest city in VN with the population of over 8 million.

2,Angel Falls is the highest fall in the world with over 1,000 feet higher

3,Lake Superior in North America is the largest freshwater lake in the world 

4,You must bring the compass or we will get lost in the forest.

5,You should take a waterproof coat during your trip to Fansipan Mountain because it is rainy there.

6,You should arrived on time at school.

7,You shouldn't walk alone after 10 pm in that park.

8,You must taking a boat trip around the islands in Ha Long Bay, it is the most important thing of the trip.

9,Antarctica is the coldest place in the world.

10,We shouldn't write on the walls or tables in our classroom.