Do you want to be happy? ____ They will help you become a happy person．

   ★Be thankful. There are so many things to be thankful for. ____ Thank your parents for preparing meals for you ; thank the school bus driver for driving you home safely and thank the mailman for bringing you your letters every day. By doing this you will feel happy．

   ★ ____ For example, read a good book , listen to your favorite music or spend time with your close friends. Don't spend too much time worrying about the future, such as going to college or getting a good job．

   ★ ____ You may forget about your trouble by joining in some activities like singing, dancing or swimming．★Help others. Many people feel happy after helping others ____ You can help a friend with his or her studies. You can read books for the children in your neighborhood. You can also be a volunteer to help the old or the disabled．

    Global Positioning System (GPS) is now a part of everyday driving in many countries. It is a space-based system that provides position and time information in all weather conditions. GPS can help people get to where they want to go.____When this happens, the driver is often to blame. Sometimes a GPS error is responsible. Most often, it is a combination of the two.

    ____Barry Brown, a GPS technologist, took an incident as an example. His friend once flew to an airport in the eastern United States. There he borrowed a GPS-equipped car to use. He wrongly plugged in the home address in the west. It wasn't until he was driving for thirty minutes that he realized it. Mr. Brown says this is a common human error. But he says, “One problem is that GPS has a very small screen and it can just tell you the next turn.____”

    “The Normal and Natural Troubles of Driving with GPS” lists several areas where GPS can cause difficulties. They include maps that are outdated, incorrect or difficult to understand. ____GPS may fail due to these reasons and then lead to confusion for the drivers.

    Although GPS sometimes causes difficulties when people are driving, the most attractive point of this system is its 100% coverage on the planet. It is important for you to have to know what you are doing when you use GPS. You need to have the “ability” to be able to use GPS because it sometimes goes wrong.____

A. There are quite a few situations showing the problems of using GPS.

B. That means that it is not really telling you about going to the wrong place.

C. This space-based system is an important tool for civil and commercial users.

D. But sometimes it sends you to the wrong place or leaves you completely lost.

E. They also contain timing problems related to when GPS commands are given.

F. Advances in technology play an active role in modernizing GPS in many ways.

G. To make GPS well used, you need a good understanding of how drivers and GPS work.