Are these well writen sentences?

1. The boy did not accept the tickets, because he felt that he did not deserve them.

2. Everyone was allowed to go to the park, except for the students who had been to the office.

3. The birds are enjoying the new bird bath.

4. When we went to the restaurant our family was seated first.

5. The zebra is a mysterious creature, because of its amazing stripes.

6. It's an honorable decision to go to college.

7. The children are quiet on the bus.

8. I am quite pleased with my new bank.

9. I bought a new vacuum, because my old one quit working.

10. The children went to the movies with their parents.

11. There is only one rain forest in North America.

12. They're an accomplished team, because they all work well together.

1, 2, 5, 9, 12 - no commas needed.

4 - comma needed.

All else is fine.

11. rainforest is one word

As an AI, I can analyze the grammar and structure of the sentences provided, but I cannot assess their content or context. However, I can provide guidance on what to consider when determining if a sentence is well-written. Here are a few factors to consider when evaluating sentence quality:

1. Grammar and Sentence Structure: Check for proper subject-verb agreement, use of appropriate verb tenses, correct use of punctuation, and overall sentence clarity.

2. Coherence and Clarity: Look for logical flow and clear connections between ideas within the sentence. Ensure that the sentence is easy to understand and does not contain unnecessary or confusing information.

3. Conciseness: Evaluate whether the sentence is concise and does not use unnecessary words or repetition.

4. Vocabulary and Word Choice: Assess the use of appropriate and precise words to convey the intended meaning.

Based on the guidelines mentioned, let's evaluate the sentences from your list.

1. The boy did not accept the tickets because he felt that he did not deserve them.
This sentence is grammatically correct and clear in terms of structure and meaning.

2. Everyone was allowed to go to the park, except for the students who had been to the office.
This sentence is well-written in terms of grammar, structure, and clarity.

3. The birds are enjoying the new bird bath.
This sentence is simple, clear, and grammatically correct.

4. When we went to the restaurant, our family was seated first.
This sentence is correctly punctuated and grammatically accurate.

5. The zebra is a mysterious creature because of its amazing stripes.
This sentence is well-written in terms of grammar, clarity, and structure.

6. It's an honorable decision to go to college.
This sentence is grammatically correct and concise.

7. The children are quiet on the bus.
This sentence is simple, clear, and grammatically accurate.

8. I am quite pleased with my new bank.
This sentence is well-written in terms of grammar, clarity, and structure.

9. I bought a new vacuum because my old one quit working.
This sentence is grammatically accurate and clear in meaning.

10. The children went to the movies with their parents.
This sentence is simple, clear, and grammatically correct.

11. There is only one rainforest in North America.
This sentence is well-written in terms of grammar and clarity.

12. They're an accomplished team because they all work well together.
This sentence is grammatically accurate and clear in its meaning.

Based on the factors mentioned, these sentences appear to be well-written in terms of grammar, sentence structure, coherence, clarity, and conciseness.