Exercise 10. Put the prepositions into the gaps

Pollution is one_________________ the most burning problems nowadays. Now

Millions_ chimneys, cars, buses, trucks all the world exhaust fumes

And harmful substances the atmosphere. These poisoned substances

pollute everything: air, land, water, birds and animals. It is usually hard to

Breathe_ the large cities where there are lots plants. Everything there is

Covered _ soot and dirt. All these affect harmfully. Every year the

Atmosphere is polluted__________ about 1000 tons industrial dust and other

Harmful substances. Big cities suffer_____ smog. Cars their engine have

Become the main source pollution in industrial countries. The loss _

The forests upsets the oxygen balance __ the new wastelands. As the result

Some species____ animals, birds, fish and plants have disappeared and keep

Disappearing.

Exercise 11. Put as many questions as you can to the sentences.

1. The world's worst nuclear reactor accident took place in Chernobyl, Ukraine, in 1986. 2. At least 31 people were killed by the accident. 3. The electro-magnetic waves have a negative effect on human health. 4. Subtle biological effects have been observed. 5. Radiation may cause mutations. 6. Cars with their engine have become the main source of pollution. 7. Big cities suffer from smog.

Exercise 12. Put the verbs in brackets into the correct form.

There (to be) numerous effects on the human environment due to the increase in noise pollution. Major sources of noise can (to be) airplanes at takeoff and landing, and a truck just off the assembly line, yet we seem (to accept) and (to enjoy) countless other sounds, from hard rock music to loud Harley Davidson motor cycles.

There (to be) two types of hearing loss, conductive and sensorineural. In conductive deafness sound-pressure waves never (to reach) the cochlea, most often as a consequence of a ruptured eardrum or a defect in the ossicles of the middle ear.

Hearing loss can (to be) entrapping in onset. Years of traumatic exposure to high levels can (to occur) before symptoms (to become) manifest. The popularity for portable sound equipment such as Walkman- type radios and tape players already (to produce) a sharp increase in clinically verified hearing loss, especially among rock music addicts who (to prefer) their music very loud.