Бывает ли на северном полярном круге полярный день? Полярная ночь? почему?

Задание 15. You have received a letter from your English speaking pen-friend Paul who writes:

...My friends and I are doing a project about professions which are in great demand. Could you tell me about occupations which are the most important to your mind? As for my news my Grandpa came to visit us...

Write a letter to Paul. In your letter:

 -tell him about the professions you consider the most important,

-ask 3 questions about his Grandpas visit  

Write 100-140 words. Remember the rules of letter writing