Lời giải:

2, If we use fewer cars, we will reduce pollution.

3, If we cycle to school everyday, we will keep fitter.

4, If we use recycled products, we will save money.

5, If people throw rubbish into the right bin, they will keep the enviroment clean.

6, If we turn off the tap when brushing the teeth, we will save a lot of water.

7, If people travel more by public transport, the harmful gases in big cities will be reduced.

8, If we start at 6.00. We will arrive there before noon.