


6/ Unless we don’t take steps to preserve natural resources, the planet will be in danger.
7/ If you had studied hard, you wouldn’t get bad marks now.!!!!!
8/ Because it was stormy they couldn’t climb up the mountain.
9/ Tortoises are said to live longer than elephants.
10/ I was made to do it by my parents.
Xem sửa giúp em với ạ! Xin cảm ơn!