Если составлять по существующим правилам, то получится что-то вроде этого:
(Страна)
(Город)
(Дата
Отправления)
Dear (Имя получателя), sorry for not writing for so long, I was busy with my exams.
I would like to ask you few questions. Have you ever worked as a club member? What do you do in your club in different seasons? Volunteering to protect the environment is popular in Russia, isn't it? I am looking forward to your answer.
Sorry, I should go, my mom is waiting for me. Write back soon!
Best wishes,
(Имя отправителя)