ネイティブの耳にどう聞こえるか その17

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Can I ask you some questions, lasalle-san?

1. When someone tells me an interesting story,
  which sounds better as my reply,
   "That sounds interesting." or "It sounds
  interesting."?
  I'd like to know how to use "that and it".

2.I'd also like to know how to use "also, too, and as well".
  I use "also" to tell someone another thing
  after I say something, like " I like baseball.
  And I also love football.".
  Am I wrong?
  "I love football, too." sounds better?
  
  And I use "too" to agree with someone like this.
  A: I like basketball.
  B: I like it, too!
  If I'm in B's shoes, isn't it a bit strange to say
  "I also like it."?

I hope you'll answer my questions.