In this case, parents should write:

1. Encourage the child: express heartfelt congratulations to the child and emphasize that this is the result of their hard work. Let your children feel your pride and recognition and enhance their self-confidence.

2. Recognize the child’s efforts: Review the child’s efforts in learning English, such as completing homework carefully, actively participating in extracurricular tutoring, etc. This helps children understand that their efforts are rewarded.

3. Emphasize the importance of English: Remind children of the importance of English in today's society. It is not only the basis for learning other knowledge, but also an essential skill to broaden their horizons and enhance their own value.

4. Put forward higher requirements: Encourage children to maintain excellent English scores and achieve equally excellent performance in other subjects. At the same time, remind children not to be complacent and to maintain a humble and enterprising attitude.

5. Support children’s interests: Respect and support children’s interests and hobbies in the process of learning English, such as reading English books, watching English movies, etc. This helps children learn and use English better. 6. Thank the teachers for their hard work: Finally, don’t forget to thank your children’s English teachers. Their hard work is the key to your children’s perfect scores.

I hope the above suggestions are helpful to you. Please adjust it according to the specific situation and write parent opinions with your own characteristics.