根据对话内容和所给首字母，在对应空格内填入一个适当的单词，使对话意思完整，所填单词必须完整写出。
A: Hello! May I speak to David, please?
B: Hello! This is David speaking. Who's t____?
A: Simon speaking. What are you going to do tomorrow?
B: I have no i____. Do you have any plans?
A: Yes. Shall we go to the zoo?
B: Good idea. We can see different kinds of animals there. A____ them, I like pandas best.
A: So do I. I can't wait to see them. B____ the way, can we feed the pandas?
B: No, I'm afraid not. It may h____them.
A: I see. Can you take your c____ with you? Mine is broken.
B: No problem. How can we get there?
A: The No.8 bus can take us there.
B: When shall we meet?
A: Let's m____ it half past eight in the morning.
B: All right. See you then at the school gate.
A: See you.
Ca2+(aq)+2OH-(aq),下列叙述正确的是