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Прочитайте текст. Заполните пропуски в предложениях под номерами В13-В18 соответствующими формами слов, напечатанных заглавными буквами справа от каждого предложения. TEST 11 (part 2)

Difficult problems

B13

The use of animals for scientific purposes is a difficult ethical problem. Many people owe their lives to modern drugs or surgical techniques that first were tested on animals.

SCIENCE

B14

Some of these developments would not have been possible without animal experiments.

DEVELOP

B15

People who campaign for animal rights are usually young and healthy, and have not yet needed the benefits of medical progress.

HEALTH

B16

Perhaps it is ethically acceptable to sacrifice animals for the sake of medical research, as long as the animals do not suffer.

ACCEPT

B17

But that theoretical point of view rises another difficult question:

THEORY

B18

what can be considered as suffering?

SUFFER