Can animals be made to work for us ? Some scientists think that one day animals may be t____ to do a number of simple jobs .They s____ that in a film or on TV we may see elephants , monkeys ,dogs ,bears ,or other animals doing a lot of things .If you w_____ carefully , you may find that those animals are given something to eat in return for d____ them . The scientists say that many d_____ animals may be taught to do a number of simple jobs if they will get something to eat .

Of course, as we know , dogs can be used to guard a house ,and elephants can be used to do some heavy j___ . And we can also teach animals to work in f____ .Apes ,for example have b____ used in America to help make cars and scientists b_____ that these monkeys may one day get in crops and e____ drive trains .