1 Mexico is the biggest city in the world 

2 My mother's room is bigger than my room

3 London is smaller than Tokyo

4 Hung is shorter than Ba

5 Fansipan is the highest mountain in Viet Nam

6 Nam is the tallest boy in his class

7 Thoa is the most beautiful girl in this village

8 The pagoda is taller than the temple

`text{1.Mexico City is the biggest in the world.}`

`text{2.My brother's room is bigger than my room.}`

`text{3.London is smaller than Tokyo.}`

`text{4.Hung is shorter than Ba.}`

`text{5.Fansipan is the highest mountain in Viet Nam.}`

`text{6.Nam is the tallest boy in his class.}`

`text{7.Thoa is the most beautiful girl in the village.}`

`text{8.The pagoda is taller than the temple.}`