7 If you don't pay the electricity bill today, your electricity will be cut off
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 exercise regularly, your body will be fitter
12 If we don't use renewable energy, we will have nothing for the future generation
13 If we don't reduce the use of non-renewable energy, the climate will change
14 If you lock all the door, no one can break into your house
15 If we don't hunt polar bears, they will become extinct in the near future
