Machines were made to be man’s servants. Yet, man has grown so (1)_______ on them that they are in a fair way to become his (2)_________. Already men spend most of their lives looking after and waiting (3)_________ machines. Machines are very stern bosses. They must be fed with coal and (4)________ petrol to drink and oil to wash with and must be kept at an (5)________ temperature.