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to get getting to be getting having got
David realized David didn't realize did David realize didn't David realize
confidence competence independence tolerance
which；whichever what；whatever what；whichever which；whatever
David; His David’s; Him David’s; He’s David’s; His
and David doesn’t too and David doesn’t either and so doesn’t David and either does David
determined to do to be determined to doing determining doing to determine to do
He himself is David. David isn’ t in. He will ask David to answer the phone.
held up hold up holding up to hold up
got through got up got on got out
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