Упражнение 12. Заполните пропуски подходящими по смыслу словами for, as, since, after, before. 1. it is commonly stated one of the chief distinctions between animals and plants lies in the fact that the animals depend upon highly organized foodstuffs... their source of supply. 2. The protozoa are considered ... very primitive organisms, rudimentary ancestors of higher animals, ... they are unicellular. 3. ... the discovery of streptomycin, a great deal of information has been accumulated concerning its use. 4. Rats deprived of vitamin D ... 35 to 40 days become unable to use their hind legs.
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1) before;
2) for, as;
3) After;
4) since.
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