Present perfect tense negative exercise - Tenses exercises

Complete the negative sentences with the correct present perfect form of the verbs.
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Buying your favourite tennis rackets have never been so easy! (be)
COB has not shown for duty, sir. (show)
So we have not changed anyone 's mind. (change)
Handling a faucet has never been so intuitive. (be)
You have not seen me for ages and you slam the door in my face? (see)
The Commission has not presented the Council with any proposals for tax or any measures to improve mortgage rates. (present)
If payment has not arrived within 7 days, the order will be cancelled. (arrive)
Supposedly, but it has not stopped them from shelling out $35,000 a year for an empty building. (stop)
He has not shown any sign of his intentions of giving in. (show)
Oh my goodness, I have not laughed like this in years. (laugh)
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