1 . 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.