The two things are the same in outward form but different _____.
We all admired her ______ the way she saved the children from the fire.
We should not ________ economic growth that will harm the environment.
---- Do you surf the Internet a lot?---- Well,_______, I’m too busy with work to surf the Net.
Every possible means ________ to prevent the air pollution, but the sky is still not clear.
He felt ______ as soon as he realized that he had asked a foolish question.