A
Some bullet trains don’t run on tracks at all. They fly over them. They 1 (call) maglev bullet trains(磁悬浮高速列车)，and they use two groups of magnets to move. One group pushes the trains up and off the tracks and the other group pushes the trains forward, 2 makes the trains go much faster and make less noise, too. The world’s 3 (fast) train now is a maglev train in China. It has a maximum speed of 600 kilometers per hour.
B
Polio is a scary disease 4 (cause) children to lose the ability to move and walk. More than 60 years ago, it frightened parents everywhere. Tens of thousands of children 5 (fall) to the disease. Today, we don’t really need to worry about polio. In the mid-1950s, scientists came up with a special treatment to decrease the chances of getting the disease. 6 (give) to millions of children around the world, the treatment saved them all and offered them a good chance at a 7 (health) life.
C
Great magicians can change people’s attention easily. They do it with grand hand gestures. They also do it 8 asking questions and changing the subject. Anyone can be a magician, but 9 (become)a great one, you have to work at it. Learning tricks isn’t enough. You need to develop your performance and people skills, too. All of those 10 (help) you put on a great show and surprise people with your magic.