Idiom
He did me a good turn by recommending me for the post of Vice Principal.

became suddenly good
did an act of kindness
returned my kindness
improved my prospects

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Idiom
Select the correct statement about active and passive immunity.

Immunological memory is established by passive immunization
A vaccination is an example of the introduction of passive immunity into the body
The antibodies utilized in active immunity are acquired from another organism
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies

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