Verified answer

Ответ:

If people didn't waste water, it wouldn't be serious water shortages in many parts of the world.

If I didn't have a car, I would cycle to work.

If factories didn't pour chemicals into rivers, rivers wouldn't be polluted.

If people didn't leave rubbish on beaches, they wouldn't be dirty.

If we didn't take care of our planet, it would be in danger.

If he had a garden, he would grow vegetables .

If Mary didn't live in a flat, she would have a dog.

Объяснение:

Conditional II - Past Simple ( в придаточной части)  и would+V(в главной части)