Complete the sentences using "if" and "when" 1. if pollution ( to distrub) the balance in nature all living things (not to live) in harmony. 2. if the air and the water are polluted. many 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 (not to be safe) to live in. help me