Use the verbs in brackets in the correct tense for.
1.if population (to disturb) the balance in nature all living things(not to live) in harmony. 2.If the air and the water a polluted.Meny species of plants and animals(to disappear) 3.We (to put)up a tent when we(to go)to the camp.
4.When we(to go)camping we never(to make) campfires.
5. If we (not to pay) attention to pollution, our, Earth (to not be safe)to live in.