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 PLS!!!!