Dear Andrii!
Thanks so much for the invitation to your party. I am a great lover of 
the 
countryside resorts, especially when they have a variety of  entertainment possibilities.
Unfortunately, it won’t be possible for me to come Correct article usage
apply
in
 the beginning of July to join in. You know that I was running a few projects during the Change the preposition
at
last
 three months and sadly one of them meets a deadline Linking Words
in
 the end Change preposition
at
Correct your spelling
of
if
 July. Correct your spelling
of
That is
 the main reason for me to work all hours now to finish my project on time, and that’s why I really have no chance to take even one day off work to join you and your friends for the celebration.
In any Linking Words
case
 I wish you a great time at your party. I am sure that Add a comma
,case
next
 time would be Linking Words
more lucky
 for me to visit you and I will do it with great pleasure.
With hope to see you soon!
PaulReplace the words
luckier