Idiom
He has built a big business empire by his sharp practices.

keen business skills
dishonest dealings
sharp intelligence
extreme hard work

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Idiom
To leave someone in the lurch

Constant source of annoyance to someone
To put someone at ease
To desert someone in his difficulties
None of these
To come to compromise with someone

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Idiom
To play second fiddle

None of these
To support the role and view of another person
To do back seat driving
To be happy, cheerful and healthy
To reduce importance of one's senior

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