1) could/may/might a) diễn tả một lời đề nghị b) chỉ một khả năng-diễn tả những gì mà người nói cảm thấy chưa chắc chắn lắm 2) should a) diễn tả một lời đề nghị,lời khuyên,một bổn phận b) diễn tả một lời đề nghị,lời khuyên,một bổn phận, một sự mong đợi 3) must a) trách nhiệm hoặc bổn phận, một sự suy luận hợp lí b) không mang tính bắt buộc mà chỉ thấy cần phải làm  4) have to a) diễn tả một lời khuyên, đề nghị b) có nghĩa gần như must, không mang tính bắt buộc mà chỉ thấy cần phải làm  5) The customer ________ choose between the exchange student program and an international school in their home country. The decision is in their hands. a) should b) would c) can 6) Children __________ be accompanied by an adult in the swimming pool. a) must b) may 7) It's a school night so you ________ stay up too late. a) wouldn't b) needn't c) shouldn't 8) It ________ be perfect; just do your best. a) don't have to b) didn't have to c) doesn't have to 9) She ________ like spicy food, so let's choose a different dish. a) may not b) needs to 10) Living in an extended family ________ sometimes lead to disagreements. a) have to b) must c) might 11) She _ visit her grandparents every weekend because her parents tell her to do so a) must b) can 12) You _ eat too many sweets; it's not good for your health. a) wouldn't b) shouldn't 13) We had an F score on our Math tests. We _ study harder to improve our scores. a) should b) need to 14) My parents _ worry about me because I’m a self-motivated student. a) needn't b) may not 15) A presentation about the generation gap _ be a great idea. a) would b) need to 16) People from generation Z _ use apps in creative ways since they've been acquainted with such apps from a young age. a) have to b) can 17) Many first-generation immigrants ________ adapt to the new cultures. a) may not b) cannot c) didn't have to 18) My parents said that I ________ dye my hair after graduation. a) could b) wouldn't c) have to 19) We ________ buy more groceries because we have enough for the week. a) need b) needn't c) cannot 20) Immigrants might / have to learn the local language if they want to communicate efficiently. a) might b) have to 

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