Pollution

"Children and grown-ups must do their best to keep the world clean," Mr. Fox said to his class. "Sometimes we see some rubbish in the streets and we must pick it up. Sometimes we eat some sweets and we must put the wrappings in the bin. We must all work together so there's no rubbish in the world. Never throw plastic into the sea! There should be no oil in the sea. If we pour poison--oil is poison in rivers and seas--into our rivers, some fish die. This is called pollution. This weekend, see if you can find some examples of pollution and write some sentences about it."Jimmy looked worried when he went home.
On Monday, he handed in his composition. "Yesterday we had sardines for lunch. Mom opened the tin, but all the fish were dead because the tin was full of oil!" Adapted from Longman English Grammar Practice.