Surprise:
* Wow!
* Oh!
* Goodness!
* My goodness!
* Gosh!
* Yikes!
* Holy cow!
Joy/Excitement:
* Hooray!
* Yay!
* Hurray!
* Woohoo!
* Yes!
* Awesome!
Disappointment/Sadness:
* Oh, no!
* Alas!
* Ugh!
* Bummer!
* Darn it!
Agreement/Approval:
* Okay!
* Alright!
* Sure!
* Absolutely!
* Right!
Disagreement/Rejection:
* No!
* Nope!
* Never!
* Uh-uh!
Anger/Frustration:
* Ugh!
* Argh!
* Shoot!
* Darn!
* Phooey!
Thinking/Hesitation:
* Hmm...
* Uh...
* Well...
* Let's see...
Calling Attention:
* Hey!
* Look!
* Listen!
* Psst!
Other:
* Ouch! (Pain)
* Help! (Urgent need)
* Stop! (Command)
* Thank goodness! (Relief)
* Bless you! (Courtesy)
Remember that interjections are often followed by an exclamation point (!) but not always, especially in informal writing.