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. The detective left no stone unturned to trace the culprit.

took no pains
used all available means
resorted to illegitimate practices
did very irrelevant things

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Idiom
White blood cell act

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

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