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8. If you don't stop smoking, your cough may be worse.
9. If we don't use less fossil fuel, they will be run out soon.
10. If it doesn't stop raining today, we may be faced with a serious flood.
11. If you do morning exercises regularly, your body will be fitter.
12. If we don't use renewable energy, we will have nothing for the future geneneration. ( xem lại đề, vế if thiếu động từ, renewable energy là năng lượng tái tạo)
13. If we don't reduce the use of non-renewable energy, the climate will change.
14. If you lock all the doors, no one can break into the house.
15. If we don't continue hunting polar bears, they will become extinct in near future.