--Now most teenagers write to each other not by letter ________online.--Yes, the Internet has become a part of their life.
—____dress is this? —It`s______.
—Maria, are those____ knives? —No, ____ knives are here.
—What class is he in? —He is in _____, _____.
Mr.Brown is ______America,but now he is ______China.
标出以下三个句子正确的升降调。 What`s your phone number? Does your mom have long hair? That`s right.