Ex2

1. is; will plant            

2. recycle; will help 

3. will save; don’t waste       

4. will have; use  

5. is not; will be

Ex3
1-C
2-E

3-B

4-A

5-D

Ex4

1. If we pollute the air, we will have breathing problems

2. If people pollute the water, a lot of fish will die

3. If we cut down trees in the forest, there will be more floods

4. If the soil is polluted, plants will die

5. If there is noise pollution, people and animals will have hearing problems

Ex5

1. If you walk to school, you will make the air less polluted

2. If you use recycled paper, you will save a lot of trees

3. If the Earth becomes hotter, the plant and animal will die soon

4. If parents teach their children about the three Rs, they will help the environment so much

5. If you want to save a lot of electricity, don’t use the bulb

Chúc bạn học tốt <3

2. 
1.is ; will plant         2.recycle; will help       3.will save ; don't waste     4. will have; use      
       5. isn't hoặc "is not" nha; will be
3.  1 ->c    2->e      3->b      4->a       5->d
 1.If people have a shower instead of a bath, they will save a lot of water.
2. If she likes this "green" shopping bag, I’ll buy one for her.
3.If you plant more trees, the air won’t be so polluted.
4. If you are patient, you’ll remember the answer.
5.If you see someone throw rubbish on the road, what will you do?
4.
1. If we pollute the air, we will have breathing problems.

2. If people pollute the water, a lot of fish will die.

3. If we cut down trees in the forest, there will be more floods.

4. If the soil is polluted, plants will die.

5. If there is noise pollution, people and animals will have hearing problems.
5.

1. If you walk to school, you will make the air less polluted.

2. If you use recycled paper, you will save a lot of trees.

3. If the Earth becomes hotter, the plant and animal will die soon.

4. If parents teach their children about the three Rs, they will help the environment so much. 

5. If you want to save a lot of electricity, don’t use the bulb.

Chúc bạn thi tốt <3
Đúng thì cho mình xin câu trả lời hay nhất+5 sao nha~
Sai thì mình xin lỗi ạ!