—Is your brother _______ TV?—No,he's _______ a book.
How long does it take you _____ to work?
_____ our group, Li Fei often goes to bed late _____ school nights.
—What time do you usually get _____?—Well, _____ six thirty.
There are ______ rules in my family, so what can I do?
—It is useful book!—Yeah, it tells you how to play guitar.