Question:

You deal and open 1. Partner responds 1NT. You might play that as forcing, semi-forcing, or "nothing special". You need to make sure you and partner are on the same page. For our answer, we'll assume semi-forcing which means partner has up to 12 points and we are allowed to pass.

What is your action after 1NT with: 

Q8754
K2
KQ2
Q103

Answer:

Pass. You don't have to bid anything and you have nothing else to say. If partner happens to have a three-card limit raise, you are likely better off stopping on the one level even if you aren’t in your eight-card fit.