________ Dongtai you see today is _______ different city from what it used to be.
—Mr. Hu, can you tell us how to learn swimming well?—Sure. But remember we can learn nothing well _______ hard work.
I think _______ necessary for you _______ breakfast.
As we know, ________is good for our health.
— Must I finish my homework at once?— No, you ___________.
—Would you mind the room? —Certainly not. I’ll do it right away.