Complete the sentences using the modal verbs "can" , "may" , "must" :​

Thank you for your letter, it was great to hear from you. I'm sorry I haven't written for a long time. It's great that you are going to a music festival.
Actually, I spent my holiday very well. Firstly, I was on the concert of my favorite band Blur, i really like this band and the concert was absolutely awesome. 'm suppose that it was one of the greatest event in my whole life, i really enjoyed it. The weather was perfect: was sunny, but not actually hot and there were very few clouds in the sky.

To be honest, i can't precisely say was it good or bad. I was relaxing from school and watching different movies at home in front of TV. But it's not that bad, i mean i was walking with my friends several times a week and it was great to take a rest from learning something. Actually, it was nice and i like that, because I don't love being overwhelmed. Also i spent 2 weeks with my grandparents in the countryside. I love them for patience and understanding. And now, in the beginning of the new school year, i am full of positive emotions and ready to start working on my education.