I forgot to include the following sentences. Thank you very much for the help.

I wonder if you could say "a post office in Oxford Street instead on Oxford Street" in British English.

1) I have to keep my homework exercise book in order.
2) At school I mustn't: arrive late for classes, go into the labs with my schoolbag (I must leave it outside the labs), copy (cheat) during a written test, use my mobile phone, chat with my classmates when my teacher explains (during the teachers' explanations), change or modify the marks in the class register.
3) I can ask my teachers a question (Can you also say "I can ask a question to my teachers?") , if she gives me permission.
4) When I do the washing-up, I hang the clothes outside in the sun (for them to dry) so they get dry more quickly.
5) At home I have to take care of the family pets. I like feeding my fish because when he sees food he swims very fast to catch it.

1 is OK.

2) At school I mustn't arrive late for classes, go into the labs with my schoolbag (I must leave it outside the labs), copy during a written test, use my mobile phone, chat with my classmates during the teacher's explanations, or change or modify the marks in the class register.

3) I can ask my teacher a question, if she gives me permission.
I can ask a question of my teacher?

4) When I do the laundry, I hang the clothes outside to dry in the sun so they get dry more quickly. <~~more quickly than what?

5) At home I have to take care of the family pets. I like feeding my fish because when he sees food, he swims very fast to catch it.

1) To keep your homework exercise book in order, you can follow these steps:

- Assign a specific place or shelf to store your homework exercise book.
- Make sure to always put it back in the designated place after you finish using it.
- Avoid writing or doodling on the book's cover or pages, as this can make it messy and disorganized.
- Use dividers or separate sections within the book to categorize different subjects or assignments.
- Regularly go through your notes and materials and ensure they are in the correct order.

2) The list of things you mentioned that you mustn't do at school includes various rules and regulations. Here's an explanation for each of them:
- Arriving late for classes: Make sure to be punctual and arrive on time for each of your classes.
- Going into the labs with your schoolbag: Most schools require students to leave their bags outside the labs to prevent any accidents or mishaps.
- Copying (cheating) during a written test: It is important to maintain academic integrity and not cheat during tests or exams.
- Using your mobile phone: Many schools have rules against using mobile phones during class hours as they can be distracting.
- Chatting with classmates during teacher explanations: It is important to pay attention and not disturb the class while the teacher is explaining a concept.
- Changing or modifying marks in the class register: Only authorized individuals, such as teachers or administrators, should be allowed to make changes to official records.

3) In British English, you would typically say "I can ask my teachers a question." The phrase "I can ask a question to my teachers" is grammatically correct but less commonly used.

4) When doing the washing-up and wanting to dry clothes quickly, you can follow these steps:
- After washing the dishes, collect the clothes or laundry you want to dry.
- Hang the clothes outside in direct sunlight. Find a suitable place, like a clothesline or a drying rack.
- Make sure to spread the clothes evenly and leave enough space between them to allow proper air circulation.
- The sunlight and airflow will help the clothes dry more quickly.
- Keep an eye on the weather, as rainy or cloudy days might hinder the drying process. In such cases, consider alternatives such as using a dryer or an indoor drying rack.

5) To take care of your family pets and specifically feeding your fish, you can follow these steps:
- Ensure you have the appropriate food for your fish. Different types of fish may require specific diets, so consult a pet store or do some research to determine the suitable food.
- Feed your fish a measured amount of food. Overfeeding can be harmful to their health, so be mindful of the quantity.
- Observe your fish's eating habits and adjust feeding accordingly. Some fish may eat quickly, while others may take their time.
- Enjoy watching your fish eat, as it can be entertaining and rewarding to see them respond to the food. However, avoid tapping on the tank or making sudden movements that could startle them.
- Remember to regularly clean the fish tank and replace the water to maintain a healthy environment for your pet fish.