2 * Choose the correct options. 1 Christopher doesn't mind to pay / paying for English
lessons. He goes on holiday to England every year.
2 Amy avoids to sunbathe / sunbathing. She has blonde
hair and very white skin.
3 Do you want to go / going camping at the weekend?
4 Marco and his mum choose flying/ to fly when they visit
their family in Italy
5 Carly pretends to be / being cheerful when she's away,
but I think she really misses home.
6 Do we really need to take / taking four big bags with us?
We're only going away for three days.​

Since ancient times nature has served man, being the source of his life. for thousands of years people lived in harmony with environment and it seemed to them that natural riches were unlimited. but with the development of civilization man’s interference in nature began to increase. every year world industry pollutes the atmosphere with about 1000 million tons of dust and other harmful substances. many cities suffer from smog. vast forests are cut and burn in fire. their disappearance upsets the oxygen balance. as a result some rare species of animals, birds, fish and plants disappear forever, a number of rivers and lakes dry up. the pollution of air and the world’s ocean, destruction of the ozone layer is the result of man’s careless interaction with nature, a sign of ecological cities. environmental protection is of a universal concern. that is why serious measures to create a system of ecological security should be taken.