compulsory - required by law or a rule, confine - to keep within a certain area, contaminate - to make something dirty or harmful because of dirt, chemicals, or radiationr r, determine - to discover the facts or truth about something, digestion - the body's system of breaking down food, feasible - possible; able to be done, infect - to invade the body and make someone ill, integral - being an essential part of something, nationwide - happening or existing in all parts of a country, optimistic - hopeful and confident about the future,

REX level 4 3A

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