Mark the letter A, B, C, or D to indicate the correct option that best fits each of the numbered blanks. In the USA, table manners are essential for (18) ________. Basic etiquette includes waiting for (19) ________ before starting to eat, using utensils properly, and keeping elbows off the table. Chew with your mouth closed and (20) ________. It’s customary to say ‘please’ and ‘thank you’ (21) ________. Napkins should be placed on your lap, (22) ________, place them neatly beside your ...