Безотлагательно I. Fill in the missing words in the letters below. Choose

Безотлагательно I. Fill in the missing words in the letters below. Choose from the following. (See example):
in reply appreciate send ask enquire concerning translated payment delighted enclose faithfully grateful hearing please regarding regret hesitate sincerely sorry
1. Dear Ms Chan, .. (1) to your letter of 24 April, (2)..the exhibition in Anytown in August, we are (3)......to inform that our company will be taking part in.
(4)..............the conference, we will (5).........it if you could .. us details of all the delegates. We would also (5)..........you to let us have details of the equipment you need for your presentation. We look forward to (6)..........your reply. Yours (7)..........
2. Dear Sir/Madam Your company has been recommended to us by a business associate and I would like to (8) your translation services. My company has recently entered the export market and we need advertising material (9) into Chinese, Italian, and Turkish. We would be (10)........if you could send us your prices and terms of (11)......... We look forward to (12)..........from you. Yours (13)..........
3. Dear Mr Kadenza I was very (14)..........to hear about your problems with the new super vacuum. I have investigated the complaint and I (15)..........to tell you that the problem is the result of faulty operation. I (16).............a copy of the inspector's report with this letter. If you require us to repair the machine, do not (17)..........to contact me at the number above. Yours ,