If the letters are all individual shapes (as opposed to compound shapes), select the letter and the white hole, and hit Command-8 (or select Object > Compound Path > Make) to knock out the hole. Do this for all three letters that need it.
If the letters are all individual shapes (as opposed to compound shapes), select the letter and the white hole, and hit Command-8 (or select Object > Compound Path > Make) to knock out the hole. Do this for all three letters that need it.