Write the jobs with the suffix -ist. e.g. He looks after your teeth. He's a dentist.
4 He looks after your teeth. He's a...
2 She works with plants. She's a...
3 He works in a laboratory. He's a ...
4 He works with chemicals. He's a...
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1. What (are you doing)? – I (am translating) an article now.

2. Where (did you get) this magazine? – A friend of mine (gave) it to me yesterday.

3. Last week I (got) two letters from my brother.

4. Father (came) at 5 o’clock last night.

5. I (went) to the station to meet my friend yesterday.

6. When I (was translating) the article I (heard) some noise.

7. What (were you doing) at 8 o’clock in the evening yesterday? I (wanted) to come to see you.

8. It (was raining) from 2 till 4 o’clock yesterday. (Is it raining) still?

9. We (were watching) TV when my friends (came) to me.

10. He (fell) down when he (was running) behind the bus.

The problem of environmental pollution becomes so acute as due to the growth of industrial and agricultural production, and due to a qualitative change in production under the influence of scientific and technological progressa.Mnogie metals and alloys used by people unknown to nature in its purest form, and although they are to some extent subject to recycling and re-use, some of them scattered, accumulating in the biosphere as waste. The problem of environmental pollution in full growth rose after in the XX century. significantly expanded the number of people they used metal began to produce synthetic fibers, plastics, and other substances having properties not only well-known nature, but harmful to the organisms in the biosphere. These substances (number and variety of which is constantly growing) after their use are not available in the natural cycle. Waste production activities increasingly pollute the lithosphere, hydrosphere and atmosphere of the Earth. Adaptation mechanisms of the biosphere can not cope with the increasing amount of neutralization of harmful substances its normal functioning, and natural systems begin razrushatsya.1) Pollution litosfery.Pochvenny cover the Earth is an essential component of the biosphere. That soil shell determines many processes occurring in biosfere.Nesovershenstvo agricultural practices leads to a rapid depletion of soil, and the use of extremely harmful, but cheap pesticides for pest management and to improve productivity exacerbates the problem. Equally important is the extensive use of grassland into desert huge tracts zemli.Ogromny harm soils causes deforestation.