缺词填空（新概念考查，根据所给的首字母，写出形式和意义都正确的词，共5小题，每小题1分，满分5分）
My friend, Patrick, has always been a fanatical o_______ of Mr. Lane’s Radical Progressive Party.
Many owners of private cars are going to offer “free rides” to people on their way to work. This will r_________ pressure on the trains to some extent.
He waved d_______________ to his companion, who had been water skiing for the last fifteen minutes.
If explosives are used, vibrations will cause the roof of the mine to c_______________.
Fishermen and sailors sometimes c_______________ to have seen monsters in the sea.