Smart Choice 2 - Must Be, Might Be, Can't Be

It has been raining for hours. There ______ be a flood later.

• might
• can't
• must

Smoke is coming from that mountain! It _______ be a volcanic eruption.

• could
• might not
• can't

My grandmother _________ have sent that email. She doesn't know how to use a computer!

• must
• might
• couldn't

Diego _______ be a talented musician. He plays in a popular band.

• couldn't
• must
• can't

Frida isn't answering her phone. She _________ be in the movie theater.

• may
• must
• can't

It ________ be a dust storm. It's raining outside!

• can't
• could
• must

That restaurant __________ be open. It's dark inside and the door is locked.

• must
• could
• can't

The ground is shaking. I'm not sure what's happening, but it _________ be an earthquake!

• couldn't
• could
• may