nick is strong. he lift this box.

a. must b. can c. could d. have to

2. in many countries all children attend elementary school.

a. must b. could c. have to d. can

3. i didn't come to the party yesterday because i study.

a. could b. must c. have to d. had to

4. dogs bark.

a. must b. could c. can d. have to

5. i speak to jimmy?

a. must b. can c. could d. have to

6. people eat in order to live.

a. could b. must c. can d. have to

7. in order to be a good shop-assistant, you be rude to customers.

a. can't b. don't have to c. couldn't d. mustn't

8. she isn't very clever. she answer your question.

a. can b. mustn't c. can't d. has to

9. if he wants to become a good specialist, he study well.

a. must b. has to c. could d. can

10. annie is busy. i take message?

a. have to b. can c. must d. could