Giúp mình với!

Here are the answers with the correct words circled: 1. Students must/mustn't → **mustn't** charge their tablets and return them after school. No student is allowed to bring their tablet home. 2. Students can/can't → **can** use 3D printers for their projects. However, they must/mustn't → **must** ask for permission from teachers. 3. My sister has to/doesn't have to → **doesn't have to** wear a uniform. Her school lets students wear regular clothes. 4. "I told you! We have to/must → **have to** submit our assignments before classes! It's in the Student Handbook!" 5. Notice for all students. No phones are allowed in the classroom. All students have to/must → **have to** put their phones in their lockers during class. 6. When using the school's computers, students mustn't/don't have to → **mustn't** install any software on the computers. 7. Teachers must/mustn't → **must** upload their lessons online. Sometimes students can't go to school or need to look at the material a second time at home. 1. Students **must not** send instant messages during class. 2. "I **have to** do a presentation in each subject at the end of the semester." 3. Our school doesn't have a rule about attending class in person. We **do not have to** go to school every day. We can sometimes just study online. 4. Students **must have** a teacher's permission before using the school lab or computer room. 5. Students **must not** bring food or drink into class. 6. We **must not** use our tablets outside of class. The school has a rule about it. 7. Teachers **do not have to** wear suits to school, but their clothes must look clean and professional.