II
III
IV
100

He _____________ be a vegetarian. I have never seen him eating meat.

He muest be a vegetarian. I have never seen him eating meat.

100

He's working full-time and studying for his Ph.D. That ________________ be easy.

He's working full-time and studying for his Ph.D. That can't be easy.

100

You ________________ be right - but I'm going to check to make sure.

You might be right - but I'm going to check to make sure.

200

She's won prizes for her research. She _______________ be really intelligent.

She's won prizes for her research. She must be really intelligent.

200

You haven't studied yet so you ____ be exhausted.

You haven't studied yet so you can't be exhausted.

200

We're not sure if this painting is an original. It ________________ be worth thousands of dollars.

We're not sure if this painting is an original. It might  be worth thousands of dollars.

300

You’re a zookeeper? That _____ very interesting.

You’re a zookeeper? That must be very interesting.

300

Really? He has to work on Christmas Day? He ______ feel very happy about that.

Really? He has to work on Christmas Day? He can’t feel very happy about that.

300

I ________________ not be able to go to the football game. It depends on whether I can get the afternoon off from work.

I might not be able to go to the football game. It depends on whether I can get the afternoon off from work.

400

Come inside and get warm – you ____ be f_____  out there.

Come inside and get warm – you must be freezing out there.

400

It ______ be far away now. We’ve been driving for hours. Where’s the map?

It can’t be far away now. We’ve been driving for hours. Where’s the map?

400

You just ate a huge dinner! You ________________ be hungry again already!

You just ate a huge dinner! You can't be hungry again already!

500

He ______ live near here because he comes to work on foot.

He must live near here because he comes to work on foot.

500

It _____ be a burglar. All the doors and windows are locked. 

It can’t be a burglar. All the doors and windows are locked. 

500

Wow - look at that diamond necklace. It ________________ cost a fortune.

Wow - look at that diamond necklace. It must cost a fortune.