Краткое пояснение: Необходимо вставить подходящие по смыслу слова из рамки в пропуски в тексте.
- 1) However, research on animals has brought us many benefits.
- 2) On the other hand, many of these experiments cause pain to animals.
- 3) Furthermore, not all animal testing has brought benefits to human beings.
- 4) On the one hand, there are strong arguments for and against animal testing.
- 5) To sum up, scientists try to make experiments as humane as possible.