结合显微镜使用，请回答问题

先通读下面的短文，掌握其大意，然后在每小题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

    Good morning, everyone. I want to 1 you about my neighbor(邻居)，Mr. White. There are 2 people in Mr. White's family. Mr. White is a manager of a big shop. Mrs. White teaches English in a university(大学).Her students like her very much 3 she is interesting. The Whites have two 4 . The son is Tim. He is thirteen. The daughter is Nell. She is twelve. There is also a brown 5 in their family. 6 name is Stella.

    Mr. White loves sports and he is good at playing tennis. Mrs. White likes 7 . She draws many beautiful pictures. Tim 8 listening to music. He has many CDs. Justin Bieber is his favorite singer. 9 is Nell's hobby? She likes doing some 10 . She has a lot of books in her room now. On Sunday, then take their cat to the nark and they often have a .good time there.

在盛有氯化铜、氯化亚铁和氯化铁混合溶液的容器中加入铁粉和铜粉，讨论以下几种情况阳离子或金属单质存在：（用Cu、Fe、Fe²⁺、Cu²⁺、Fe³⁺等化学用语回答）

（1）反应后有铁剩余，则容器中固体还可能有____ ．

（2）反应后铜有剩余且有相当数量的Fe²⁺，则溶液中可能存在____ ．

（3）反应后溶液中有相当数量的Cu²⁺，则还可能有____ ．

（4）若反应后容器中除有相当数量的铜离子外，若还有相当数量的铜，则一定不存在的有____ ；若有相当数量的Fe³⁺存在，则一定不存在　____ ．