现有一包白色固体样品，可能含有BaCl₂、Na₂SO₄、Na₂CO₃、NH₄HCO₃、KCl、CuSO₄中的一种或几种，取样品进行如下实验：

（1）操作1所用到是玻璃仪器有____ ．

（2）原白色固体中一定不含有____ ，一定含有____ ．

（3）写出生成气体a的化学方程式____ ．

依次填入下面一段文字横线处的语句，衔接最恰当的一组是(　　)

中国古代有“三不朽”思想，　　　　　　。　　　      　　　。　　    　　　　。

　　　　　　。　　　　　　，　　　　　　。 

This room is small．____ ____ that room?

阅读下面短文，用所给动词的适当形式填空，使短文完整、通顺。每空不限一词。
     Rose is one of the funniest girls in her class. She looks like a boy, and she is good at ____ (perform). So she____ (choose) to play Harry Potter by her classmates last week. She said happily, “I'm sure that I ____ ( do )the job well because I____ (see) the movie many times already.”
    Dick, one of Rose's best classmates, is also an actor in the play. He____(like) to perform the play with Rose. He said, “We are confident that we____ (do) well in our school art festival next week.”
    Mrs. Smith, their teacher, pays much attention to their play. She often____(encourage) them. Yesterday afternoon when she ____ (watch) their performance, she took photos of them. And the photos____(send) to their headteacher next month. They hope their performance ____ (be) the best.