When you reply to a business letter, you usually begin by making reference to aprevious communication. Complete the beginning of replies to the five letters with a word from the box. A. request B. confirming C. enquiry D. complaint E. invitation 1. Thank you for ________ the dates ... 2. With reference to your ________ for advice... 3. With reference to your _________ about the low quality... 4. Thank you for your ________ to visit your stand ... 5. With reference to your _______ about the course ...