Complete the following sentences using must be, can be or might be
Ross and Jack must be good players. They've won hundreds of oups.
I'm not sure what my wife is doing this afternoon. She might be doing yoga or she might be at her dance class. I can't remember.
A: My grandmother is 80 and she goes jogging every day.
B: Amazing! She must be very fit for her age,
A: Beatrice is in Prague at the moment.
B: She can't be in Prague, I saw her this morning!
I don't know where Kelly is now, but she can't be at her sister's place.
You passed all your exams! You must be very pleased with yourself.
A: I have no idea why my wife hasn't arrived home from work. She can't be working overtime because I phoned the office and she wasn't there.
B: I suppose she might be having a drink with her colleagues or she might be
shopping.