次の英文を読み、空所に入れるのに最も適切なものをそれぞれ下の①〜④のうちから一つずつ選んでください。 Many cosmetics and drug companie s test their products on animals to make sure that they are safe. (9), this kind of testing is cruel and unnecessary. (10) people who support animal testing say that animals are not harmed during tests, animals usually have to live in small cages in laboratories. In addition, animals are often badly injured during testing, and some are even killed. (11) drug companies need to make their products safe for people, their products don't always have the same effect on animals and humans. So it's possible that these tests don't show how products might affect humans. (12), according to the Food and Drug Administration, over 90 percent of drugs that are used in testing are safe for animals, (13) ) are not safe for humans. (14) animal testing harms animals and may not help humans, researchers should stop testing products on animals.