TEST B. Choose appropriate modal verb inside the box that fits the sentences. Write the letter of the correct answer in your notebook. a. could b. have to c. don't have to d. must 6. I have to submit my project by tomorrow. 7. Why is that man looking around like that? He must be lost e. can't 8. John always fails the tests, even though he's clever. He can't study enough. 9. Could you please give me the doctor's telephone number? 10. I don't have to explain myself to you because I am innocent.