正数A的平方根为2m- 4与3m-1，则A的值为（   ）。

根据对话情景，在画线处填上适当的单词，使对话完整通顺。

A: Hello!

B: Hello!   1  is Bob. May I speak to Peter please?

A: Speaking.

B: Hi, Peter. Can you help me?

A: Certainly.  2  the matter?

B: My model ship doesn’t ___3_____. Can you mend (修理) it?

A: Yes. But I am busy today. What about Sunday morning?

B: Sorry, I can’t hear you. The line is   4  .

A: How about half   5  eight on Sunday morning?B: OK. Thanks a lot. See you then.

A: See you.