Ms. Brown is a teacher. Her students are ____ these days because of (因为) the school ____ to the Summer Palace. It's next week. But she is so ____ these days and she doesn't have ____ to go. She tells her students about it and they are not happy. But at last, the students persuade (说服) her and she decides (决定) to go ____ with her dear students.

There are two new students in our class.I don't know _____of them.
 

如图是一个电解水的装置，其中A中产生的气体是____，B中产生的气体可用 ____来检验,该实验证明了水是由____组成的。

①真正的哲学可以更新人的观念，解放人的思想

②哲学是变革社会的巨大物质力量

③哲学源于实践，是时代精的精华

④真正的哲学能为社会变革提供正确的指导