'Please' and 'Thank you' are the little courtesies by which we keep the ...... of life oiled and running smoothly.

path

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machine

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garden

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river

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Solution

The correct option is B machine
A machine has to be oiled regularly to keep it functioning smoothly.
So, here a comparison is drawn between life and machine, where Please and thank you serve as the oil for its smooth functioning.
option B

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