Don’t turn on the TV, Father ______.
—I’m sorry that I broke your pen. Let me buy you a new one. — . I have another one.
—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 ___________.