-- Is this your book? --No, it isn’t .It belongs to . A. my, he B. mine, him C. me, his
—Shall we go to the park? — __________________
—Humans can’t live _______ air. —I agree with you.
____ up late at night is bad for your health.
— ____ do you clean the classroom? — Three times a day.
He prefers _______ to __________.