根据上下文和首字母提示，补全下列单词。

1. My pens and books are in my b______.

2. I don't have a pencil s______. Do you have one, Tom?

3. Do you have a n______? You can take notes (记笔记) in it.

4. This is my phone number. You can c______ me.

5. What's this i______ English?

某溶液中可能含有NH₄⁺、Ba²⁺、Fe³⁺、Ag⁺、OH^-、SO₄^2-、CO₃^2-中的某几种，现用该溶液做以下实验： ①取此溶液少许，加足量盐酸无明显现象；

②另取少许加入足量浓NaOH溶液，有白色沉淀生成；

③将②中沉淀过滤，取滤液微热，有无色刺激性气味气体放出，该气体能使湿润红色石蕊试纸变蓝。

由此推断，该溶液中肯定有________________________，肯定无________________________。