1) Where is Mary? — Mary is in Mexico City. (So I am in Mexico City.) 2) What language does she learn? — She learns Spanish. (I learn Spanish.) 3) Does she work hard? — Yes, she does. She works very hard. (I work very hard.) 4) Is Mexico City larger than Cleveland? — Yes it is. Mexico City is much larger than Cleveland. (Mexico City is much larger than Cleveland,) 5) Is it more interesting? — Yes, it is more interesting. 6) Is Mexico City the biggest city in the world? — по тексту она считает его самым лучшим городом в мире (I think it is the best city in the world…), а в вопросе спрашивается Мексико-сити самый большой (the biggest city) город в мире? Может в тексте ошибка или в вопросе? 7) Is there too much traffic and smog in the city? — Yes, it is. There's too much traffic and smog. (But there's too much traffic and smog,) 8) Are there many restaurants with American food there? — There are not enough restaurants with American food. (… and there are not enough restaurants with American food,) 9) Are Mary's teachers very nice? — Yes, all of Mary's teachers are very nice. (All of my teachers are very nice.) 10) Do they speak English to their students? — No, they are not. None of them speak English to the students. (None of them speak English to us…) В скобках — цитаты из текста для подтверждения ответа.