Question

There is a man Waiting _ (to by at) the corner of the street

Answer 1

Explanation:

there is a man waiting at the corner of the street

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Answer 2

$\text{There is a man waiting \green{\fbox{\colorbox{lightblue}{\pink{at}}}} the} \\ \text{corner of the street. \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$