Modals of Deduction

I'm sure he'll find a job soon. = It _______ be long before he finds a job.
1. could
2. won't
3. should
Perhaps you're right. = You _______ be right.
1. might
2. will
3. can't
I'm sure you're joking. = You _______ be joking.
1. shall
2. must
3. may
That's definitely not a good sign. = That _______ be a good sign.
1. must
2. may
3. can't
I'm going out but I'm sure I'll be home soon. = I _______ be long.
1. might
2. won't
3. can't
You have taken some medicine, so you'll probably feel better soon. = You _______ feel better soon.
1. shouldn't
2. should
3. must
There are no more rooms available. I'm sure the hotel is full. = The hotel _______ be fully booked.
1. may
2. can't
3. must
They have done nothing all morning. = They _______ be really bored.
1. shall
2. can't
3. must