Business correspondence. Dear Ms Denton, 1 (Thanks/ Thank you) for your letter of 24 May. As I am sure you will 2 (understand/appreciate), I am 3 (most upset/very sorry) to 4 (hear/learn) that you 5 (were unable to/could not) locate my suitcase. As I 6 (said/pointed out) in my original letter, the suitcase contained 7 (a lot of/many) documents that I 8 (need/require) for my 9 (work/job). I have 10 (been obliged/had) to 11 (contact/get in touch with) my publishers to 12 (get hold of/obtain) copies of documents that your airline 13 (lost/mislaid). 14 (Naturally/Of course), I will 15 (complete/fill in) the Claim Form, but I 16 (find it difficult/it is not easy) to 17 (estimate/guess) the value of the documents. 18 (About/Approximately) half of them are irreplaceable. I 19 (hope/ trust) that in the meantime you 20 (are still looking/continue to look) for my case. 21 (Should you find it/If you find it), please contact me 22 (straight away/immediately). I 23 (look/am looking) forward to hearing from you.