Exercose 21, use doesnt dont arent isnt or am not
2.don't 3.aren't 4.am not 5.doesn't 6.aren't 7.don't 8.isn't 9.don't 10.aren't 11.doesn't 12.aren't 13.don't 14.isn't 15.doesn't 16.aren't 17.doesn't 18.don't 19.aren't 20.don't
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