Read the following passage and circle the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbers blanks

Robots now have many uses. Many factories use robots to (7) ________ lots of hard work quickly and without many mistakes. These are ‘industrial’ robots. The military uses robots to find and get rid of bombs. If a robot (8) __________ a mistake, the robot is damaged or destroyed, which is better than a person being killed. There are also robots that help at (9) _________, to vacuum or cut grass, for example. Such robots must learn about the area of work. There are two robots on Mars. Because it (10) __________ a long time to send a signal from Earth to Mars, the robots do much of their work alone, without commands from Earth. People still think of robots as having a shape like a person – two legs, two arms, and a head.