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Question 1:
Ben felt like an idiot after blathering on to his friends about mechanics when he didn't know anything about*^*that subject. His wife cautioned, "If you don't know, people will think you are smarter if you say nothing. A still*^*tongue keeps a wise ........"
A. tooth
B. thought
C. head
D. mouth

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English Slang Idioms (20) | B2 – Upper-Intermediate