1) Just help yourself if you' d like more to eat. You ___________ask first. a) needn't b) mustn't c) may not d) shouldn't 2) There's plenty of time for you to make up your mind. You ___________ decide now. a) needn't b) mustn't c) may not d) shouldn't 3) You _________ wash those tomatoes. They've already been washed. a) needn't b) shouldn't c) mustn't d) couldn't 4) You _________ keep it a secret. I don't want you to tell anyone else. a) must b) could c) need d) may 5) You ________ hand in this paper by next Thu; otherwise, you will fail this test. a) must b) need c) should d) might 6) Our teacher ___________ be angry when he knows this news. a) must b) should c) need d) may 7) You've been travelling all day. You ____________ be tired. a) must b) could c) need d) may 8) It’s essential that nobody hears us. We __________ make any noise. a) mustn’t b) couldn't c) needn't d) may not 9) You _____________ park here. Otherwise, you will be fined. a) mustn’t b) couldn't c) needn't d) may not 10) I wonder if he _____________ go there alone. a) might b) could c) must d) need 11) She _____________ go to school yesterday because of sick. a) might not b) couldn't c) mustn't d) needn't 12) You ________________ step on the grass in the park. It's prohibitted. a) might not b) couldn't c) mustn't d) needn't 13) You ______________ lose any more weight. You are already slim. a) might not b) couldn't c) mustn't d) needn't 14) I don't know where Tom is. He ___________ go out with his friends. a) may b) should c) must d) need 15) You ____________ go to school before 7 a.m. Otherwise, you will be punished by the teacher. a) may b) should c) must d) need 16) You __________ the vegetable. I have wash it already. a) needn't wash b) needn't have washed c) shouldn't wash d) shouldn't have washed 17) You ____________ all those parcels home yourself. He could help you to do that. a) needn’t have carried b) needn't carry c) shouldn't have carried d) shouldn't carry 18) You ________ to him. That was your fault. a) should have apologized b) should apologize c) must have apologized d) must apologize 19) Minh got the highest mark in the competition. He _______________ hard. a) must have studied b) must study c) should have studied d) should study 20) You _______________ the windows open last night. It was so cold. a) shouldn’t have left b) shouldn't leave c) needn't have left d) needn't leave 21) It _____________ Alison who made arrangement. I recognized her voice. a) must have been b) must be c) could have been d) could be 22) He didn't come to visit his sister. Possibly he ______________ that she was seriously ill. a) couldn’t have known b) couldn't know c) shouldn't have known d) shouldn't know 23) He knows a lot about flying plane. He ___________ a pilot when he was young. a) must have been b) need have been c) should have been d) must be 24) There ___________ an accident on South Street because the road is closed off. a) must have been b) should have been c) need have been d) must be 25) Vera __________ at the party this morning. I didn’t see her there. a) couldn't have been b) shouldn't have been c) couldn't be d) needn't have been 26) I'm so disappointed of my failure. I _____________ harder. a) could have studied b) should have studied c) must have studied d) need have studied 27) She failed the exam. It _______________ hard for her. a) could have been b) should have been c) must have been d) need have been 28) Sarah looks really pleased with herself. She ___________________her driving test this morning. a) could have passed b) should have passed c) must have passed d) need have passed 29) I __________________ more for my exams. I think I'll fail! a) could have revised b) should have revised c) must have revised d) need have revised 30) John ______________ on holiday. I saw him this morning downtown. a) couldn't have gone b) shouldn't have gone c) mustn't have gone d) needn't have gone

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