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. To cool one's heels

To give no importance to someone
To remain in a comfortable position
To be kept waiting for sometime
To rest for sometime

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Idiom
White blood cell act

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

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