Must or can't

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. Note that you will lose points if you ask for hints or clues!
Rewrite the sentences using must or can't

1. I'm sure she's at home.
She .

2. I'm certain you're crazy.
You .

3. I'm sure she thinks I'm stupid.
She .

4. I bet I look silly in this coat.
I in this coat.

5. They're always buying new cars- I'm certain they make a lot of money.
They're always buying new cars- money.