what part of a watch do we use when we greet someone ?

what part of a watch do we use when we greet someone what part of a watch do we use when we greet someone ? What do we call the part of a river where it emplies into a what do we call the part of a river where it empties into a When we meet someone for the first time we should greet him 英语翻译What do we mean when we talk of a civilization?A civiliz What do we mean when we say something is a piece of cake ___ what should we do when we have a fever ?/是什么意思 what should we do when we are on a bus? when do we use capital letter We can use ____ of every piece of paper,especially when we a what can we use computers to do?