1) She _____________ pay for her children since this museum is free to them. a) could b) doesn't have to c) don't have to d) should 2) Max ________ write two thousand words for his essay. He's not happy!   a) could b) can c) has to d) have to 3) You _______________ do this task. It's optional a) should b) mustn't c) must d) don't have to 4) You ____________ call me if you need help. I'm happy to help a) can b) might c) don't have to d) shouldn't 5) I was ____________ do 50 push ups when I was little. Now, I can't. a) could b) able to c) n't able to d) must 6) I _____________ go to school yesterday because I was sick. a) must b) could c) couldn't d) shouldn't 7) You _________ wear a helmet when riding a motorcycle. It's the law. a) should b) shouldn't c) must d) mustn't 8) You ___________ swim here a year ago, but now it's allowed a) could b) couldn't c) didn't have to d) had to 9) You ______________ bring some ID when traveling through an airport  a) have to b) should c) can d) might 10) If you are really sick, you _________ go to the doctor. a) might b) should c) can d) can't 11) Rose and Ted _________ be really good players. They have won hundreds of medals! a) many b) could c) mustn't d) must 12) You ______________ pay to use the library. It's free. a) doesn't have to b) don't have to c) can d) must 13) Jerry ________ be working today. He never works on Sundays. a) must b) can c) can't d) should 14) You ___________ 18 to see this film. a) should b) might c) couldn't d) have to be 15) You ___________ hear this story. It's so funny. a) are able to b) shouldn't c) should d) can't 16) You don't have to shout. I ________ hear you very well. a) can b) can't c) should d) must 17) It __________ be dad. That man is too short. a) mustn't b) shouldn't c) can't d) might 18) You look pretty tired. I think you ________ go to bed early tonight.  a) shouldn't b) needn't c) can d) should 19) You _________ cross the street if the light it red! a) mustn't b) don't have to c) could d) may 20) You ___________ sit so close to the TV. It's bad for your eyes. a) doesn't have to b) don't have to c) shouldn't d) couldn't

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