_____ impressed me was the boy’s ability to deal with this kind of difficult physics problem.

 _____ impressed me was the boy’s ability to deal with this kind of difficult physics problem.

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Which

What

That

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They are talking _______ they were old friends.

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as if

as although

even if

even though

Focused on       your heart asks you to do, you’ll realize your dream one day.

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that

which

what

The reason why he succeeded is ______ he worked very hard.

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why

that

whether

how

— How can I wake up so early?　　 — Set the alarm at 5:00 am. ________ you will make it.

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and

but

Be ready for the job interview, _____ you may miss the good opportunity.

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and

then