We are short _________ energy and water_________ the overpopulation.A. of; because B. of; because of C. in; because
_____ 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.