I.
Từ gạch chân là từ nào em nhỉ? Nếu là "convenient" (thuận tiện, tiện lợi) thì đáp án là A (có hại)
II.
The survival of the natural world depends on each and every one of us.
III.
1. He is not old enough to drive.
Hoặc: He is not allowed / able to drive because he is very young.
2. Country life is more peaceful than city life.
3. Going hunting Pokemon on the street is not safe for kids.
4. The boy last visited his grandparents two months ago.