Нужно написать ответное письмо.
1. Ответить на задаваемые вопросы;
2.Реакция на письмо;
3.Задать примерно 3 своих вопросов в тему.

...Most of my friends enjoy reading. Are you people in Russif positive about reading? Who are teens' favourite writers? What are their favourite genre? What are your tastes in reading?
Looking forward to hearing your opinion.
Love,
Lucy