My son is old enough to ___ himself. He likes ___ blue, but this morning he __ his white T-shirt when he got 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.