根据上下文的语境，用适当的单词完成句子，每空一词。

  (Rob=R Mom=M)

R: Hi, Mom. I'm back now!

M: Where have you 1_______? It's almost 5:00.

R: Sorry. I was at Sam's house.

M: What 2_______ you doing there?

R: Listening to music. Sam has a lot of great CDs. You should hear some of them.

M: Maybe I'll do that sometime later.

R: How 3_______ now?

M: Now? I'm busy cooking.

R: It doesn't matter. Sam let me borrow some of them. See?

M: Sam let you borrow some of them? 4_______ seems that you borrowed all of them.

R: I only borrowed 15 CDs. Sam has more than 100.

M: Oh, really? The CDs must 5_______ him lots of money.

R: Sure.

下列句子中，加点的成语使用最恰当的一句是( )。

A．某大学法学院教授认为，打击盗版无可厚非，而以黑屏手段惩罚盗版用户的行为则是完全没有法律依据的

B．沪指连续七周下跌，很多被套股民备受煎熬，都想尽办法快弥补巨额亏损，因此一度消失的非法“代客理财”又东山再起

C．改革开放三十年的实践经验告诉我们：只有解放思想，实事求是才能带来大发展、大繁荣的局面，如果胶柱鼓瑟就只能落后且永远没有出路

D．如果求真与务实分离，言而无信，说一套做一套，如此首鼠两端，就会败坏风气，失信于民