4. recycles - won't produce

5. don't water - will die

6. is - won't go

7. will save - don't waste

8. will happen - keep

9. don't stop - will endanger

10. dump - won't be

V
1. If you work hard, you will pass the exam.

2. If Henry fails his examination, his parents will be sad.

3. If Sue goes out this weekend, she won't have time to study.

4. If it snows tomorrow, I will go skiing.

5. If he doesn't leave soon, he'll miss the bus.

6. If you play with matches, you will hurt yourself.

VI
1. we will reduce the amount of pollution

2. the environment won't be polluted

3. we plant more trees

4. we keep throw garbage into the river.

5. we will reduce the amount of your family bill.

VII 
1. recycled

2. reusable

3. reduce

4. off

5. recycling

6. less

7. reuse

8. save

=>
4. recycle/will not produce
5. don't water/will die
6. is/won't go
7. will save/don't waste
8. will happen/keep
9. don't stop/will endanger
10. dump/will not be

V/
1. If you don't work hard, you won't pass the exam.
2. If Henry fails his examination, his parents will be sad.
3. If Sue go out this weekend, she won't have time to study.
4. If it snows tomorrow, I will go skiing.
5. If he leaves soon, he'll miss the bus.
6. If you play with matches, you will hurt yourself.

VI/
1. we will protect our environment.
2. we will have fresh air
3. we don't waste paper
4. water is polluted.
5. we will save energy.

VII/
1. recycled
2. reusable
3. reduce
4. off
5. recycling
6. less
7. Reuse
8. save