1.Mexico City/big/city/world.

=> Mexico City is the biggest city in the world.

2.My mother's room/big/my room.

=> My mother's room is bigger than my room

3.London/small/tokyo.

=> London is smaller than Tokyo.

4.Phanxipang/high mountain/Viet Nam

=> Phanxipang is the highest mountain in Viet Nam.

5.Hung/short/Ba

=> Hung is shorter than Ba.

6.Nam/tall/boy/his class.

=> Nam is the tallest boy in his class.

7.Thoa/beautiful/girl/village

=> Thoa is the most beautiful girl in this village.

8.The pagoda/tall/the temple

=> The pagoda is taller than the temple.