Frank thinks math is easy, ______ I think it’s difficult.
_____ 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.
——What is Grace doing? ——She _____ in the pool.