There are several ways in which American dining customs are different from those in other parts of the world. A guest invited to dinner is__20__ to arrive on time. The use of the fork and knife is often different. The fork is used mostly in the left hand. It__21__ the food without the help from the knife, which is generally used only to cut meat or potatoes, and is placed to the right of the plate when __22__. And while in many places the napkin is put around the neck, here it is put__23_ . Finally, when Americans eat certain foods, they use their fingers. For example, at__24__they eat chicken, pizza and so on with their hands only.