Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. His friends advised him to be fair and square in his dealings.

Polite
Upright
Careful
Considerate

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Idiom
White blood cell act

As a defence against infection
For clotting blood
As a source of energy
As a medium for oxygen transport from lung to tissues

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