如图所示是实验室常用的气体制取装置．在用双氧水和二氧化锰制取氧气的实脸中，可选用的发生和收集装置是____（填装置的编号）．在此反应中，二氧化锰的作用是____．

下列各句中，没有错别字的一项是（      ）

根据对话内容, 从方框内选出能填入空白处的最佳选项。

A: Hello! May I speak to Jane, please?

B: ____ She is out at the moment.

A: Is that Mr. Smith?

B: Yes. ____

A: This is Tom. Jane invited me to the concert tomorrow. I'd like to come, but I can't.

B: ____ 

A: My mother is ill.

B: ____ Don't worry. I think she'll be all right soon.

A: I hope so. ____

B: No problem. I'll leave her the message.

A: Thanks a lot. Bye!