47. will understand ... practise

48. will do

49. need

50. won't be

Exercise 2

1, If we plant more trees, the air will be fresher.

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

3, If we cycle to school every day, 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 environment 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 six, we will arrive there before noon.

9, If the boy eats so many green apples, he will be ill.

10, If we use reusable bags for shopping, we will reduce w

Chúc em học tốt. Cho anh xin 5 sao và CTLNH.

Exercise 2

1, If we plant more trees, the air will be fresher.

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

3, If we cycle to school every day, 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 environment 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 six, we will arrive there before noon.

9, If the boy eats so many green apples, he will be ill.

10, If we use reusable bags for shopping, we will reduce w