Idiom
The class could not keep a straight face on hearing the strange pronunciation of the new teacher.

remain silent
remain serious
remain disturbed
remain mute

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Idiom
Which statement regarding the mammalian heart is correct?

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

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