answer和reply有什么区别

answer和reply有什么区别
He had hoped that divorce would be the___to all his problems.
Wev are still waiting for him to___to our requests for further assistance.
In___to his suggestions,they have decided to consult him for more details.
He___his critics by claiming that he was responding to the new needs of globalization.
上面几个该填什么?等待中...