Natural resources are things that we use that come from Earth. ______ natural resources are limited(有限的). This means that they will not ______ forever. Some are renewable, like when you plant a new tree when you ______ one down. Others are not renewable, like when you dig coal(煤) out of the ______. Once it is used, it is gone.

People realize the ______ that Earth’s natural resources are limited, and can do things to help conserve(节约) those resources. ______ you try to conserve a natural resource, you try to use less of it, so it does not get used up so ______. One way that people conserve fuel, like gasoline, is by riding a bicycle or walking when the distance is short instead of driving everywhere.

Water is a very important natural resource because we all need it to stay ______ . We can conserve water by making sure that our pipes and taps do not leak(漏). We can also make ______ choices to conserve water, like only using the dishwasher ______ washing machine when they are full. Everyone can make contributions(贡献) to protecting natural resources.

There are many man-made wonders and natural wonders all over the world. Let’s know about some information about some of the man-made wonders of the world. I am sure you will be interested in them.

	There are about eighty pyramids known today. The most well-known was for Pharaoh（法老）Khufu. It is known as the “Great Pyramid”. It’s also the largest one. Workers used about 2.3 million blocks of stone to build it. It took twenty years to build it.
	The garden sat on a hill. It was a large and wonderful structure（建筑物）. Many parts of the garden were high up on large columns（支柱）. There were many big and green trees with lovely flowers. Although there are many different ideas about the garden, we are not sure whether this wonder ever existed（存在）!
	The Lighthouse of Alexandria was designed about 2,000 years ago. It was in Egypt, too. It was one of the ancient wonders of the world, about 135 metres high. It was once the highest building in the world. Although it doesn’t exist now, many people come to see its relic every year.

According to a research, more than 130 billion pounds of uneaten food go to waste in Laura`s country each year. That is about 30% of the yearly food supply（供应）. It is a sad fact, especially when you consider how many families and homeless people are in hunger.

When Laura saw her school dining hall throw away food that was not eaten at all every day, she came up with an idea. She started a project to help her school dining hall to give away uneaten food to homeless shelters（庇护所）in her community. In the past three years, the same project has spread to other schools and some fast food restaurants throughout the city. The project is called Feed & Find, and has already fed thousands of people in her city. How does it work? Through an app, Feed & Find matches local homeless shelters with school dining halls and restaurants that have uneaten food to provide. When dining halls or restaurants have uneaten food left, they can use the app to share the information about the food. A truck driver working for the project is then sent to pick it up and take it to a shelter.

Pretty cool, right? It’s not surprising that people in other cities have got in touch with Laura, hoping that she could have developed similar projects for their communities.

Some people, however, have concerns about the safety of the uneaten food. They think such food may not be clean enough. Still, this project is a clever way to help solve the problem of food waste and it helps those in need.