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.
Large cities with thousands of smoky industrial enterprises appear all over the world today. The by-products of their activity pollute the air we breathe, the water we drink, the land we grow grain and vegetables on.
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 the ecological crises.
Verb Past Simple Past Participle
be was / were been
do did done
find found found
meet met met
read read read
see saw seen
give gave given
get got got
speak spoke spoken
come came come
have had had
I have a large school bag. there are lots of interesting things. in school bags lay textbooks for classes. still lie notebook. I have a pencil case in which there is a pen, pencil, eraser, ruler. for drawing lessons I carry the album in which I draw with crayons. in a small pocket school bag lying paint brush and clay.
ex2
1. Remember! we must take our passports.
2. We mustn't be late
3. You must read it
4. I must phone him today
ex 1
1. coat
2. binoculars
3. spaceship
4. satellite
