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 class could not keep a straight face on hearing the strange pronounciation of the new teacher.

remain unaffected
remain serious
remain indifferent
remain silent

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Idiom
Which statement regarding the mammalian heart is correct?

In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs
Oxygen-loaded blood moves only through the right side of the heart
Blood is pumped from the heart via the atria
When the right atrium contracts, it forces blood into the left atrium

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Idiom
At one's beck and call

Enjoying oneself without caring for others
To be in an advantageous position
To be always at one's service
To be under one's subjugation

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