"Jack! Answer the phone! It ________ be your grandma calling again!"
must
That ______ be true, it's impossible fly without a plane.
can't
I _______ need to study tonight. My last test grade was bad.
might
Everybody looks young in this movie. It _____ be old.
must
I can't really tell who that is, but it ___________ be Martin.
might/could
That's her bag, she __________ be here.
must
Do you know what type of flower this is? I'm not sure, it _______ be a rose.
could
That team is usually so bad! I _______ believe they won!
can't
I told you! She ______ here! She had to catch the train early.
isn't
What's that noise? ~ I'm not sure. It ________ be thunder or it _______ be a plane.
might ~ could
I'm not 100% sure who is in the video, but it _________ be that famous movie star.
could
I recognize that boy. He _________ go to my school.
might
Twenty dollars? That ______ be right. We only had two drinks.
can't