—I'm too busy preparing the exam. Could you do _______to help me?—Of course. I can do _______for you if you want me to.
Watching ______ TV is bad for our eyes.
It’s important ______ us students ______ carefully in class.
Don’t always play tricks ______ your classmates.
Tom is fat. The doctor asks him to ______ and ______.
—Would you like some ______? —Yes, please. I’m hungry.