Passive voice perfect 4 предложения A major problem was that even when cases (detect) and (report) by health units they necessarily (not/include) in national reports.

Until late in the 19th century virus for vaccination (obtain) from the pustular lesion of one vaccinated person and (scratch) into the arm of other individuals to be vaccinated.

Some vitamins safely (give) by vein, others by administration under the skin so that they only very slowly (absorb) into the blood.

Genetically modified organs yet (not, test) in humans but experiments in animals (conduct).

anyta141006    3   19.12.2021 11:27    1