单项选择题
A．exercised B．followed C．played D．performed
A．Because they sometimes play tricks on people. B．Because they refuse person-to-person communication. C．Because they can stay alone while remaining sociable. D．Because they feel puzzled when communicating with each other.
A. I’m free now B. make sure C. I’m afraid I can’t make it D. give me your number E. who’s calling F. It’s very kind of you G. You’re welcome H. take care