Who teaches ________ music— Nobody. I teach ________.

The way ________ was thought of by him of doing the experiment was similar to the way ________ you carried it out.

Don’t look down upon Bob. He has his own advantages.—Oh, yes. 　　　others are weak, he is strong.

The river smells terrible. People_______ dirty things into it .

Students in English-speaking countriesusually address their man teacher ‘sir”, but __________ their woman teacher“madam”.