Составьте предложения
а)
1. At present one of the most important problems for mankind
2. The rivers, seas and oceans
3. That purifying air, water and soil is changing from a national to a global problem
4. Therefore, it is necessary
5. Scientists expect that
6. Large-scale experiments in this area
b)
1. are becoming seriously polluted by industry.
2. are successfully being carried out on a global scale.
3. it is possible to eliminate air and water pollution by planned actions of human society as a whole.
4. is evident to all.
5. to take measures to safeguard natural resources and the environment on a global scale.
6. is that air and water pollution is reaching very large proportions.

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