Ответ:
1. I always feel nervous when I fall out with my friends.
2.Helen cannot go for a walk today as she has too much homework.
3.When I am 25 I will throw a cool birthday party.
4.Have you ever lost anything valuable? - Yes, I have. It was my iphone.
5. I find changing schools the most stressful for a teenager when you have to make new friends and be on the same page with new teachers.