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 have an axe to grind

To work for both sides
A private end to serve
To have no result
To fail to arouse interest
None of these

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Idiom
White blood cell act

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

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