3 * Fill in: natural, toxic, living, biodegradable, non-flammable. 3 One of farm is 4 Trees a on wir 5 Globa to biro 1 Many cleaning products contain chemicals so check the labels carefully. 2 Car engines must be made from materials so that they don't catch on fire. 3 Not a lot of people know that fossil fuels come from things which existed thousands of years ago. 4 shopping bags break down naturally in the earth and reduce pollution. 5 Water is an important resource and only 2.5% of all water in the world is fresh. ..