高中英语语法填空 thanks

高中英语语法填空 thanks
Which came first? The chicken or __1_egg ?
If the chicken came ___2__ , then didn’t it hatch from an egg? And __3__ the egg came first, didn’t a chicken lay it? Even scientists cannot answer __4__. So how did my teacher expect us to know more about this subject than them?
Not __5_ (know) where to start, I turned to my aunt. She told me that Ms Barb probably didn't expect a "correct" answer , but was looking for us to present a reasoned argument. Or maybe Ms Barb was just trying to encourage __6__ (we) to be imaginative
My roommates and I had a heated discussion __7___the question later that evening.We tried to give reasons to support our arguments. Some people said, "The chicken came fist. Human beings __8__ (create) chickens just like they invented cats, dogs and pigs"
Others said ,"The egg cam fist. The egg might be some other animal's egg.__9__ some chages took place when it wa hatched. So, it turned into a different animal, which __10_ (call) chicken by people.
What do you think?