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usual, happening often.
Common
an action against law.
Crime
a period when you are not working
free time
physical activity that keeps you fit.
Exercise
stop doing something halfway
give up
almost the same.
Similar
strong and well, not sick.
Healthy
something that can create a problem
Disadvantage
making air, water, soil, etc.. dirty
pollution
a person who study or investigate something scientifically
Researcher
