阅读短文，判断对错。

    I have a friend. It has a big screen. It can't say a word, but it can help me with my study. I use(使用) it to learn English, play a game, surf on the Internet(网络) and make friends. It's very useful(有用的). Take a good care of it, or(否则) it will be broken. Can you guess what my friend is?

北国的冬天，真的很美．一代伟人***曾有诗词“北国风光，千里冰封，万里雪飘，望长城内外，惟余莽莽…”的描述，其中冰是　____ 　形成的，雪是　____ 　形成的，有时北方的雪没有融化成水就慢慢变少了是因为雪　____ 　了．（填物态变化的名称）