___of them has a dictionary and ___one of them can look up words in the dictionary
--Is your iPad black, Mary? --No, it isn’t. ______________ is white.
— Where is your father? — He Australia and he Sydney for two weeks.
— Have you ever been to Shanghai? — Yes. I there with my father last year.
— How is your English study? — Not bad. But I learning English grammar.
— Do you think yesterday’s math problem was difficult? — Yes. I could work it out.