Нужно сделать упражнение 8(b).
4 предложения - should и 4 предложения с should not

Shouldn’t
1. We shouldn’t throw garbage in the sea
2. We shouldn’t use plastic bottles.
3. We shouldn’t waste electricity
4. We shouldn’t throw away food.
Should
1. We should take care of our pets.
2. We should plant more trees
3. We should use less petrol.
4. We should keep rivers clean.