In dealing with public relations, we should make every effort to prevent the _____ in personality.

(2009·上海高考)David threatened ________ his neighbour to the police if the damages were not paid.

Mr. Smith, who often helped passers-by repair their bikes, said that what he did was not paid but _______.

I have a lot to say in relation ______ _the affair.

The plan _____ just because people were unwilling to cooperate.