Doing homework ______ a quarter of my free time every day.A. picks up B. takes up C. puts up
—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 __________.
There _____ an exciting party at Mr. Wang’s this evening.