—You look so tired. What’s the matter? —I was so busy that I didn’t go to bed 12 o’clock last night.
Tom studies _______. He _______plays with his friends.
—do you exercise? —Hardly ever.
I have ____________ homework to do and I’m _______ tired now.
The problem is _________ difficult ________ students can solve them.
---Why don’t you go out to play, Rose? ---I’m afraid I can’t. I have much homework _______.