3. Diana used to ________ to work, but now she is used to ________ because the road is crowded and she also wants to keep fit.

Kevin is a special swimmer. He took risks to ______ in very cold places because he wanted people to pay attention to environmental problems.

As a boy, Kevin visited national parks and he learned the Earth is in ______ condition. He felt worried, and he wanted to ______ the Earth. In 2009, he went to swim in water near North Pole（北极）to draw people’s attention to the melting glaciers（融化的冰川）. Kevin said that the swim was so painful that it would be his ______ time swimming in cold water. In 2016, he heard about a lake in the Himalayas（喜马拉雅山脉）. It was formed by melting glaciers. He ______ to swim in cold water again. It was difficult to swim in the lake. The air was so ______ that it was hard to breathe. He told people about his experiences on TV. He wanted people to know that glaciers in the Himalayas are disappearing ______ global（全球的）warming and that there’s less water for people in nearby ______ like China, India, and Pakistan.

From Kevin’s story, we learn two ______ . We learn that people can do a lot of harm to the Earth without realizing it. Also, we learn that if we ______ the way we think, we can do something to protect our environment. With the new way of thinking in our minds, we can enjoy a bright future.