题目内容：

    Because deaf people can’t hear, they have special ways of communicating. For example, they can learn to understand 1. someone is saying by looking at the mouth of the speaker. This 2. (call) lipreading. Also, speaking is very difficult for the deaf, because they can’t hear 3. (they) own voices. However, it is possible with special training. According to many deaf people all around the world, the most 4. (practice) and popular way of communicating is with sign language.