Question

He ..........works hard.I am sure of it.

Answer 1

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$\mathfrak{The\:Answer\:is}$

He indeed works hard. I am sure of it.

$\boxed{Hope\:This\:Helps}$

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Answer 2

He works hard is a complete sentence on its own..

still, it can also be:

He always works hard. I am sure of it.