---OK,I've had enough of it. I give up.---You can't ______ your responsibilities.
It is no use ______ a lot without doing anything.
______by many people,the spokesman made an exciting speech.
At the same time,they are taking strong _______ to protect wildlife resources.
To enjoy the scenery,he would rather _____ long hours on the train ___ travel by air.
His suggestion ____ the meeting be delayed was turned down.