Answer:
Question 1: make no change, the grammar is correct in sentence 1.
Question 2: Change it's to its, because it's is used to shorten 'it is,' and is not used for possession.
Question 3: Change kaos to chaos.
Question 4: Change chose to choose, because chose is past tense.
Question 5: Change the period to a question mark.
Hope this helps, I tried to explain as much as i could ;)
