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Read these sentences and choose the correct answer to fill in the gaps.



1. It was 9 p.m. Sam __________ go home.

a) had to;

b) must.

2. You __________ press the button to open this window.

a) had to;

b) must.

3. Tourists haven't eaten for a few hours, so they __________ be hungry.

a) must;

b) can.

4. Alex is 20 minutes late, there __________ be something wrong.

a) must;

b) can.

5. John's brother is 6 years old but he __________ write and count.

a) must;

b) can.

6. Daniel __________ speak Chinese, but maybe he'll learn it someday.

a) couldn't;

b) can't.

7. Nobody __________ tell me what was wrong.

a) could;

b) couldn't.

8. Ann earns a lot of money. She __________ buy whatever she wants.

a) can;

b) is able to.

9. Will James __________ solve this problem?

a) can;

b) be able to.

10. I've lost my key! I __________ get inside the flat!

a) am not able to;

b) can't.