阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空（每空不多于两个单词）。
Today is Saturday. It's nine o'clock. The Smiths ____ (be) all at home. Mrs. Smith is watching TV. She ____ (like) watching TV and shopping. She wants to buy ____ bike on TV, because she wants to ride it to work. Mr. Smith is ____ (read) a newspaper. There is some news about Liu Huan. And his favorite ____ (sing) is Liu Huan. He sings very ____ (good). Their son, Jim, is talking on the phone. He is calling one of his ____ (friend). He wants to go to the zoo to see animals with his friend. Their daughter, Lily, is playing ____ her small dog. She is only four years old. Look, she's eating a banana. This is ____favorite fruit. What's that over there? Oh, it's a cat. It's sleeping. Jim, please keep quiet ____ don't wake it up!
过量的CO在高温下还原相同质量的原混合物，固体减少的质量为