1) OK
2) OK
3) Those who oppose animal testing say that it is not always reliable because an animal’s reaction to a drug can be different from a human’s. Furthermore, there are many cases of scientists' causing pain to animals when they do experiments.
http://grammar.ccc.commnet.edu/grammar/gerunds.htm#possessive
4) In their opinion, human life is more important than the life of an animal. There are alternatives to animal testing. Some experiments use computer models and programmes.
5) OK
6) Many animal rights groups break the law to try to stop animal testing. There are even animal rights terrorists who attack research centres and intimidate workers
I forgot to include the following sentences,please. Thank you very much for your help.
1) However, European law says that animal testing cannot be used for beauty and cleaning products.
2) Those who support animal testing say that it is a necessary evil since it helps scientists to develop vaccines as well as new surgical techniques.
3) Those who oppose animal testing say that it is not always reliable because an animal’s response to a drug can be different from a human’s. Furthermore, there are many cases of scientists causing pain to animals when they do experiments.
4) In their opinion human life is more important than the life of an animal. There are alternatives to animal testing. Some experiments use computer models and programmes.
5) Human tissue can also be used to test drugs. Other methods include analysing statistics.
6) Many animal rights groups break the law to try to stop animal testing. There are even animal rights terrorists are people who attack research centres and intimidate workers
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