There are people in the park on the National Day.
--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.