—________.

It me one hour my homework.

My father usually to work.

    On TV we can see elephants, m, dogs, bears or other animals doing a lot of things for us. For example, elephants can carry things, dogs can look a houses and lead blind people to cross streets. If we watch more c, we can find those animals always get a little food to eat after they have done something. So scientists say many d animals may learn to do more easy w for us if they know they will get something to eat.