根据短文内容，用方框中所给词的正确形式填空，使短文完整、正确。（每词只能用一次）

The verb “chat” means to talk (to someone) in a friendly, informal (非正式的) way. Today there are many   on the Internet where you can chat. You can chat with people all over the world, in many languages and about many subjects. These places are   called “chat room”. Sometimes you need to register (注册) to enter a chat room. This means that you need to offer a usename (用户名) and possibly your e-mail   .Your usename doesn’t have to be your   name. It can be any name you want. When you have your usename, other people in the chat room will call you by that name and else can use it.
Chatting is a good way to   your informal English, Messages in a chat room are usually short sentences. Sometimes   are not even sentences,    just a few words that are not really grammatically (语法) correct. It’s a typical way in which we   in a quick conversation with friends. To save time, people often use abbreviations (缩写形式) like TTYL (talk to you later) or IDK (I don’t know). So don’t go to a chat room to practice “perfect English”. Go to a chat room to practice informal English and find new    You can even use a chat room to help improve your typing skills if you want.