A company making profit from genetically modified potatoes would probably only say good things about genetically modified profits, so they'd likely be biased.
A book written by a freelance author whose previous books were about other scientific issues would likely have the book about genetic modification in general, rather than the historical development of it, so his book wouldn't be the best source to use.
A book written by a woman who believes she got sick from genetically modified products would probably be biased against genetically modified products, so her book wouldn't be the best source.
A book written by a scientist who helped develop the technology to genetically modify vegetables would probably know a lot about the historical development, considering he helped develop it. This is the best source to use in my opinion.
1. If the weather was nice, she often _walks_ ( walks, walked)
2. Jerry always helped me with my assignment when he _has___( has, had) time
3. when there was vacant time in school, we __went__ ( go, went) to the next room to see our admirers.
4. If there was group activity, I__stay__ (stay, stayed) quite on the side.
5. I _used_ ( use, used) to go the canteen when i asked permission from the teacher to go to the bathroom.
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