根据对话情景和内容，从对话后所给的选项中选出能填入每一空白处的最佳选项。选项中有两个为多余选项。
Marry: Tom, I've just moved to a new house．
Tom:    小题1: 
Marry: Thank you, and I'd like to buy a new television set．
Tom:    小题2:  
Marry: A color TV set, of course．But I'm not sure about the size．Maybe we should buy a big one．If we buy a small one, we might have to change it in a few years' time for a big one．小题3:
Tom: In my opinion, I don’t think it necessary to buy a very big one．
Marry:    小题4:  
Tom: Yes．As we know, your sitting room isn’t very big．If you put in a very big television set, it will be bad for your eyes．Besides, a smaller TV set can have clear pictures．
Marry:   小题5: I’ll think about it．
Tom: You’d better make a quick decision because the price may go up soon．

A．Wow, how I envy you!

B．What is your opinion?

C．What kind of television do you want to buy?

D．Mm, that’s quite true．

E．Why do you think so?
F．Is there any reason?
G．Really? Congratulations!