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Here are the corrected sentences: 3. We shouldn't be rude to our elders. 4. Students should pay attention in class. 5. Students shouldn't use their mobile phones in the exam. 6. Tom shouldn't eat so many sweets. It's bad for his teeth. 7. The kids shouldn't spend so much time in front of the TV. 8. You are overweight. You should go on a diet. Here are the connected sentences using the given conjunctions: 1. You shouldn't eat much fast food, and you shouldn't eat sweetened food. 2. The meeting is very important, so you mustn't be late! 3. Hoi An is a city, and it is famous for its old buildings, shops, pagodas and houses. 4. The Tet holiday is shorter, but people enjoy the festival very much. 5. He isn't very tall, but he is kind and friendly. 6. She has a round face, and she has short black hair. 7. She doesn't want to be late for school, so she gets up very early.