a)
Phrases that show hesitation: Erm … Oh … well …, Hmm…
b)
A: Shall we go to the cockroach race tomorrow?
B: Oh… well.., I don’t know.
A: Do you want to watch the hamburger eating contest tonight, Bob?
B: Let me see. Erm… I’m not sure yet.
A: How about going to the bug eating festival next weekend?
B: Hmm… let me think about that.