Oh! - Surprise/ Realization (eg. Oh! I forgot my wallet)
Wow! - Amazement/ Excitement (eg. Wow! I love this house. It is amazing)
Alas! - Sadness/ Regret (eg. Alas! We lost the match.)
Ugh! - Disgust/ Annoyance (eg. Ugh! This tablecloth is really filthy.)
Ah! - Realization/ Shock (eg. Ah! Now I understand the problem.)
Hey! - Calling/ Warning (eg. Hey! Don't touch that statue.)
Oops! - Mistake/ Accident (eg. Oops! I forgot your book.)
Yum! - Tasty reaction (eg. Yum! The cake is so delicious.)
Hurray! - joy/ Celebration (eg. Hurray! Finally we won the match.)