must / can't (Intermediate)

I'm certain he's there. He ... be there.
1. must
2. can't
That sounds much too cheap. It ... be the correct price.
1. must
2. can't
You ... be Mr Smith. It's very nice to meet you.
1. must
2. can't
How can he do so much work? He ... stay late at the office every evening.
1. must
2. can't
I don't recognise any of these houses. We ... be on the right road.
1. must
2. can't
You are really good boys. Your parents ... feel proud of you.
1. must
2. can't
I bet you that Harry didn’t say that. He ... have said that.
1. must
2. can't
I’m sure he is worried. He ... feel very ashamed.
1. must
2. can't
She is in London. You ... have seen her last night at Tim’s party.
1. must
2. can't
That’s impossible. That ... be true.
1. must
2. can't

MUST / CAN'T for drawing conclusions