DIRECTIONS: Following questions have the second sentence missing. Choose the "MOST APPROPRIATE" sentence from the given options to complete it. A. Science has given up powers fit for the gods. B. ______________________. C. For example, we do not know how to manage our machines.

• A. And we should remember that they are very stem masters.
• B. Yet we use them like small children.
• C. But in practice, they have become man's masters.
• D. Machines were made to be man's servants.