----- Did you go to Sam's weekend party? ----- No, I ______________.
—I had a backache. I can’t sleep. —_______
Sam spends two hours _______ his homework every day.
— Watching TV too much _______ bad for your eyes. —I’ll go to bed right away.
Do you prefer _______?
—Mr. Hu, can you tell us how to learn swimming well? —Sure. But remember we can learn nothing well _______ hard work.