Weather changes day to day. Climate is the pattern of the weather conditions over a long period of time for a large area, and climate can be affected by the Earth’s atmosphere (大气层).

But during the past few hundred years, oil, gas, and coal have powered homes, cars, and factories. These energy sources release a _________ called carbon dioxide (二氧化碳) (CO2) into the atmosphere. This gas traps heat from the sun that would otherwise escape Earth’s atmosphere. That increases the Earth’s _________, which contributes to the planet’s warming.

Climate change affects more than temperature. Warmer water changes the patterns of ocean currents, affecting global weather patterns.

Some places will receive more _________, which could lead to flooding, while other places will get __________, which might mean droughts. Tropical storms could be stronger, and a continuing _________ in sea level due to melting polar ice might push people out of their homes.

It’s _________ to make a difference to keep the Earth healthy. Try some of these tips to _________ the amount of carbon dioxide you add to the atmosphere.

1. Instead of traveling in a car, use _________ transportation, walk, or ride your bike when you can.

2. Reduce and reuse things as much as possible.

3. Wear a warm sweater at home in the winter _________ turning up the heat.

4. Your everyday actions affect people, plants, and animals all over the world — including polar bears! So be cool by doing your best to keep the Earth well and __________!

A healthy diet (饮食) along with exercise will help you look better, feel better and live longer. But I am _______ to say that many children don’t have a healthy lifestyle. They eat much junk food _______ French fries and fried chicken. Eating too much junk food and dessert is _______. If you want to _______ a long and healthy life, you have to _______ your living habits. It is important to get a yearly physical examination, too. You don’t hope to _______ any bad news, but the doctor will tell you _______ healthy you are. It’s also a good idea for you to _______ a book on healthy eating. Drinking milk or juice from fruits and vegetables can help to _______ your health, too. I am ________ good health now. People tell me that I do not look my age. Healthy eating has helped me and it will also help you!

Happiness is important for everyone. Most people want to be happy, _______ few know how to find happiness. Money and success alone _______ lasting happiness. Happiness depends on ourselves. In other words, we make our own happiness. Here are _______ ways to help you be happier.

_______ secret of happiness is to enjoy the simple things in life. Too often, we spend so much time thinking about the future—for example, getting into college or getting a good job that we fail to enjoy the _______. You should enjoy life’s simple pleasures, such as _______ a good book, listening to your favorite music, or spending time with close friends. People who have several close friends tend to live happier and healthier lives.

The second secret to leading a happy life is to be active. Many people experience this dancing, or playing a sport. You can forget about your problems, and _______ think about the activity.

Finally, many people find happiness in helping _______. According to studies, people feel good when they volunteer their time to do many meaningful things for other people. If you want to feel happier, do _______ for someone. You can help a friend ________ his or her studies, go shopping to get food for an old neighbor, or simply help out around the house by washing the dishes.