Exercise 13. Read the examples and choose the right answer to the question from the options in the box

• Why do you think there is no article with the underlined nouns?

1. Teenagers have admitted they drop litter...

2. The survey found that boys say that putting rubbish in a bin would make them appear "soft" or "uncool".

3. Water and air pollution affects people's health.

Exercise 14. Read the definitions.

litter - waste such as empty packets, bottles and pieces of paper that people have dropped in the street or in a public place

waste — used, damaged or unwanted matter (materials or substances esp. after it has been used for an industrial process

garbage — esp. AmE, rubbish — esp. BrE waste material e. g. from a house or office to be thrown