题目内容：

Read the passage and fill in the blanks with suitable words（在短文的空格内填入适当的词，使其内容通顺。每空格限填一词首字母已给）

Each Indian tribe（部落） had different language. Many Indians never learned any language e1. their own. Do you know how Indians from different tribes talked to each other？They had two ways to talk without sound. One way was by sign language; the other was by signals.

Sign language is way talking by signs. Indians used it when they met strangers. In this way, they could find out w2. the stranger was a friend or an enemy. Indians usually used signals when they wanted to send messages to someone far away. To make signals, an Indian might use a pony（小马）. He might use a blanket. Or he might use smoke, a mirror or fire arrows.

To signal that he had seen many animals, an Indian r3. his pony in a large circle. Sometimes the Indian gave a signal like this and then went away to hide. This meant that there was danger.

The blanket signal was visible from far away. An Indian held two c4. of a blanket in his hands. Then he began to swing the blanket from side to side in front of him. An Indian could send many different signals with his blanket.

He could also send many signals with a mirror to w5. someone of danger or to get the attention of a person far away. But he also used it to send message in code. Of course, mirrors could be used o6. when the sun was shining. At night, Indians use fire arrows for signaling.

An Indian also sent signals with smoke. He made a small fire of dry wood. Then he put grass or green branches on it. He held a blanket over the fire for a minute. When her r7.  the blanket from the fire, there was a cloud of smoke. The number of clouds of smoke told his message in code.

Now you can see that Indians didn’t need to learn each other’s language. They could talk to one another by using signals or sign language.