Direction: Complete the following passage by using the words in the box. Each word can be used only once. Note that there is one word more than you need.

A new transportation device called the Segway was reported to have been in use for quite a while. Its inventor called it the world’s first self-balancing ___41___ transport vehicle for short distance travel.

The Segway looks like a large ___42___ with two wheels. The wheels are connected to a platform. The stick has handles for a person to hold. The person stands on the platform and holds the handles. The transporter moves forward or backward when the person moves his or her body in that direction. The driver turns the handles to go left or right.

Computers and ___43___ devices on the Segway make the vehicle move and balance. It is ___44___ by batteries that are recharged with electricity. It can travel at a speed of 19 km an hour.

Dean Kamen, the inventor of the Segway says it was ___45___ to reduce pollution and solve other environment problems in cities.

A Segway costs about five thousand dollars. People who have bought Segways say they are extremely useful though quite ___46___. But they can use the Segways instead of their cars for short trips, and it is a great way to save money on gasoline. The Segway also makes it convenient for people who have trouble walking because of ___47___ problems.

Segways are being used in more than twelve American airports. Security officers say they are able to move quickly on the devices in ___48___ situation.

People on vacation are also learning to use Segways. Segway tours are popular in several American cities including Chicago, San Francisco, and Washington, D. C. Tour company officials say it takes from ten to thirty minutes to teach people how to ___49___ a Segway. Then the group uses them to move around the city.