Which "mot de passe" expresses gratitude?

Which "mot de passe" do you use if you don't like the taste of something?

Which "mot de passe" do you say when someone sneezes?

Which "mot de passe" do you say to agree with someone?

Which "mot de passe" do you say at the end of something?

Which "mot de passe" to take someone's picture?

Which "mot de passe" if you didn't hear someone or if you need clarification?

Which "mot de passe" expresses empathy -- you use it when something bad happens?

Which "mot de passe" expresses certainty?