Final answer:
The correct answers to complete the sentences are: above the moon, top, down in the dumps, blown away, fell in love, become balanced into the swing of things.
Step-by-step explanation:
1) He's above the moon because he's just got A-grades in all his exams.
2) I can't wait to go round the world. Travel is so on the top of things I want to do.
3) Hearing the match had been cancelled left us all feeling down in the dumps.
4) We'd never heard such amazing guitar playing from a young kid. We were just blown away by his talent.
5) As soon as I saw the new phone, I fell in love with it. I knew I had to have it - and soon!
6) Changing colleges was one of the hardest things I've ever done. I didn't know where to go or who to make friends with, but slowly I've become balanced into the swing of things.