Dear Diana, 
1. Thank you very much for your letter and  arriving  few days ago. 
2. It is  lovely to hear you. 
3.iam  sorry I haven't  written for you for such a long time but I am very busy.
 4. As you know we will buy  new house in September. 
5. It was very  bad condition  and it need a lot  working. 
6. We  are finishing most of it  now  and it looks  very nice.
 7. Peter and I decide to  give  a house- warming party on May 3rd 
8. Do you think  you are able to come? 
9. Please give me a ring and  let me  know when you  make it.
 10. Iam  really looking forward to seeing you again.