Level 2
Level 1

UNIT 1


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healthy
having no disease, not being ill
habit
an established custom, routine
disease
illness
likely
tend to, possible to happen
stress
tension, a kind of negative feeling
exercise
physical activity
strong
not weak, powerful
cause
reason
diet
eating habit
pressure
mental or social stress
enter
to come or to go into
respond
reply, give answer
cell
the tiniest particle of an organism
defend
to keep someone/something safe, away from danger
occur
happen
produce
to create something by physical or mental force
theory
a set of principles to explain a fact
contain
include, to have within
research
careful study of a given subject
common
usual, ordinary