Ответ:

Hi, Jack.

How are you doing these days? Thank you for your letter, by the way. I was happy to receive it.

I'm glad to hear that you a new hobby. Taking pictures sounds cool. Hope to see them on your Instagram. As for me I have a new hobby as well. My hobby is swimming. I've decided to go to the swimming pool twice per a week, on Wednesdays and on Fridays after school. My family and friends think it's a cool idea, because swimming will help me to grow my muscles and feel myself more healthier and relaxed.

By the way, how was your brother's birthday? How many people were invited? What did you get for him as a present? Hope you and your family with guests enjoyed the party as well and had a great fun.

Hope to hear from you soon. Please take care of yourself and stay in touch.

My best wishes, your friend Ted.