General exclamations:
* Wow!
* Oh!
* Ah!
* Goodness!
* Goodness gracious!
* My goodness!
* My word!
* Heavens!
* Dear me!
* Crikey!
* Blimey!
* Well, I never!
* I say!
* Gosh!
* Yikes!
* Jeepers!
* Holy moly!
* Holy cow!
* Oh my!
* Oh dear!
* Yikes!
Expressing surprise:
* Really?
* No way!
* You're kidding!
* Are you serious?
* I can't believe it!
* This is unbelievable!
* Wowzers!
* Holy smokes!
Expressing joy or excitement:
* Hooray!
* Hurrah!
* Yay!
* Fantastic!
* Amazing!
* Brilliant!
* Wonderful!
* Excellent!
Expressing shock or fear:
* Yikes!
* Eeek!
* Oh no!
* Help!
* Yikes!
* Yikes!
* Yikes!
Expressing pain or distress:
* Ouch!
* Ow!
* Ugh!
* Aaaagh!
* Help me!
Expressing disgust or annoyance:
* Ugh!
* Eww!
* Yuck!
* Get away from me!
* That's gross!
* Drat!
* Blast it!
Expressing agreement or approval:
* Absolutely!
* Right on!
* You bet!
* Amen!
* Hear, hear!
Note: The specific word you use will depend on the context and the emotion you want to express.