A. If you go on a trip, where will you go?

I want to go to Jeju.

The sentence is corrected grammatically. /  capitalization​

B.1.Aech! 

    2.Oh

    3.Thank you. ✔

Another way: Your answers are okay and these are another ways of saying them.

1. Ah- choo!

2. Bless you!​

3. Thanks.​