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 robber took to his heels when the police arrived.

opened fire
hid himself
surrendered
ran off

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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. I raked my brains to solve this difficult problem.

I subjected my mind to hard thinking
I used my common sense
I brainwashed several experts
I consulted several people
I read number of books

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Idiom
Select the correct statement about active and passive immunity.

The antibodies utilized in active immunity are acquired from another organism
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
Immunological memory is established by passive immunization
A vaccination is an example of the introduction of passive immunity into the body

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