根据句意及首字母提示完成单词。

1. My English teacher isn’t in the classroom now. She is in her o_____ .

2. Jane works in a h_____ . She is a good doctor.

3. My mother is a Chinese teacher in a u_____ in Beijing.

4. This is a photo of my f_____. These are my parents.

5. This is a good hotel. Tom’s father is a m_____ in the hotel.

（）是制作BC干粉灭火剂的主要原料，添加某些结壳物料也宜制作D类专用干粉灭火剂。

A．碳酸氢钠

B．碳酸氢钾

C．氯化钠

D．氯化钾