1, It is hard to become a good student, so you need to study hard. (14 từ) (1 to be)
2, There was a apple tree there, but people cut down it. (11 từ) (1 to be)
3, Humans destroyed nature by cutting down trees and kill wild animals.
4, Environment pollution is one of the most big problem in the world.
5, Global warning is one of the most big problem in the world.
6, Playing PC games is very bad for our eyes and health.
7, Growing trees is a way that protect our environment
