In most cultures it is not ____for one to wear a red dress or suit at a funeral.
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He suddenly became ____that he was the only person who wasn't dressed formally at the reception.
To ____this new product into the European market, the company gave away 10,000 free samples to the local consumers to try.
He had kept up ____with his friends for many years, but all of a sudden, he stopped writing to them.
Your responsibility for the failure of the plan is only ____. Your partner should also take responsibility.