Free energy is everywhere around us. There are many ways to make and collect energy from     1     sources like the Sun, wind and water. People also realize that everyday stuff can be a source of energy too. For example, riding a bike, running or just     2    , etc. We     3     have to change our way of thinking if we want to change the world.

So comes the idea of solar roadways. The US Department of Transportation recently     4     $100,000 to Solar Roadways to build the first ever Solar Road Panels. The Solar Road Panels will contain embedded (嵌入的) LEDs which “paint” the road lines from beneath to provide safer nighttime driving     5     to give drivers instant instructions such as detour (绕行) ahead. There will be embedded heating elements in the surface to prevent snow and ice buildup, providing     6     winter driving.

We wear shoes every day to     1     hurting our feet. We can buy shoes in many places, for example, in the supermarket, in the store or at the     2    . But maybe most of us don’t know about the     3     of shoemaking because now most shoes are     4     by machines. Here I will tell you how to make a pair of shoes.

The first step is drawing a design (设计图样). Next the shoemaker will use paper to make a pattern. Then the shoemaker draws the pattern on some     5     like leather (皮革). After that, he cuts the leather with     6     and then he will sew (缝) and glue the leather pieces together.

Then the shoemaker connects the pieces to the insole. The insole is the part of the shoe that touches your feet. Next, the shoe is     7     to make the leather soft so it can be shaped. Then the shoe goes in an oven. This helps it to keep its     8    . At the same time the shoemaker works on the lower parts of the shoe. They are     9     the outsole and heel. When all the parts are ready, the shoemaker glues and sews them together. After these steps, a pair of shoes is     10    .