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 lose face

To be humiliated
To look vacant
To look angry
To be helpless

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Idiom
White blood cell act

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

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