Although Tokyo is one of the most expensive cities in the world, you will be surprised that there are still some free activities in Tokyo.

Free temples

    There are many temples in Tokyo. The most famous one is Meiji Jingu. This is the most important temple in Tokyo. If you visit it, you can know more about Japanese history. Of course, it's free.

Free museums

    If you go to Kanto Earthquake Museum, you can see the exhibitions and the memorial for the people who died in the 1923 earthquake disaster.

Free parks

    There are two famous parks in Japan. They are Yoyogi Park and Ueno Park. Yoyogi Park is one of the largest parks in Tokyo. It is now a great place to see street performances. Ueno Park is popular with many Japanese people and foreign visitors.

Free snacks

    Japanese food is delicious and healthy. You can try different kinds of snacks, before spending money on them. You don't need to pay for them when you try them.

    Imagineyou are taking a walk on the beautiful beach. Just then, your feet step oversomething and you hear a crack (噼啪声) —an empty plastic bottle. Things like thisare happening more often because of sea rubbish.

    Studiesshow that 80%of all the waste is from the land. The waste is mainly plastics (塑料制品) which are really hard todegrade (降解). So the rubbish will remain there for along time. Some of the pollution is caused accidentally. For example, about10,000 product-filled boxes are lost at sea every year from business ships.Sometimes people just throw things into the water from boats or land. Manylarge rubbish areas are formed in the North Pacific Ocean.

   Thankfully, the situation isn't ignored (忽视). Groups like the National Oceanic and AtmosphericAssociation (NOAA) are taking action to help clean the sea. Since 2006, 76projects have cleared out 3,814 metric tons (公吨) ofrubbish from the sea. Methods of rubbish cleaning include using machines toremove (移除) the waste away from the surface of seawater. Besides, special nets are set by the mouths of rivers to stop therubbish before it reaches the sea. If everyone does his part, sea rubbish seemslike a problem that can be solved.

    Many students aren't getting enough sleep at night, which means they end up feeling sleepy during class. {#blank#}1{#/blank#}during the day may be a solution.

    According to Forbes, a mid-afternoon nap can {#blank#}2{#/blank#}, increase your energy and help you study even better. But {#blank#}3{#/blank#}should a nap last? The proper time should be between 10 and 30 minutes, Peter Venn, a sleep expert said.

    Sleeping for {#blank#}4{#/blank#}, such as five minutes or so, is not helpful. That's just not enough time to rest. But if you sleep for too long, you may {#blank#}5{#/blank#}feeling uncomfortable.

For thousands of years, humans have explored the earth. Nowadays, we are exploring space. Many astronomers (天 文 学 家) are looking for new planets and new places for humans to live in the future. But where do astronomers start looking?

First, astronomers look for a star(恒星),because our own earth moves around a star. More importantly, it is the correct distance(距离) from the Sun for heat and light. So when astronomers have found the star, they look at the planets around it. In recent years, astronomers have found nearly 400 new planets with stars. However, many of these planets are either too near the star or too far away.

Then, if the planet is in a good position(位置), astronomers look for three key things: water, air and rock. Water is important because all life needs water. And plants produce air for humans to breathe and food to eat. Rock is also important, because there is often water under the rock.

After many years of scrutinising, astronomers have found a planet that is similar to the earth. It's Gliese 581g and it's near a star. The astronomers think it has water and rock. Gliese 581g is bigger than the earth. A year on Gliese 581g is only 37 earth days instead of 365. But astronomers do not think these are big differences and some of them think Gliese 581g will be a new earth.

You might have seen beautiful rainbows in the sky before. They form when sunlight falls on water drops in the air. But in fact, moonlight can also create rainbows in the same way. They are called "moonbows". They are similar to rainbows, but they are created by moonlight. 

Moonbows are more unusual than rainbows. Different weather and astronomical (天文学的) conditions have to be just right for moonbows to be created. The moon has to be very low in the sky — only 42 degrees from the horizon (地平线). The moon has to be a full moon or nearly full. The sky must be very dark for a moonbow to be watched clearly — any bright light can obscure it. Water drops must appear in the air in the opposite direction of the moon. Moonbows appear on the opposite side of the moon and usually look white to the human eye. This is because their colors are not bright enough to be noticed by the human eye. 

Moonbows more often appear in some locations around the world. Most of these locations usually have waterfalls, which create thin fog in the air. Some of these locations are the Yosemite National Park in California, Cumberland Falls State Resort Park in Kentucky and Waimea in Hawaii, US. 

Moonbows do really happen. So at a certain time and a certain place, when a moonbow happens to appear, you can't miss it if you're right there.

Making your school a better place will make everyone around you happier and will get you more exited to go every day. Besides，a better place will also make you more productive（有效益的）. The following are some of the ways to make your school a better place. 

◆{#blank#}1{#/blank#}Do not stay silent when you see another student getting hurt by others. Speak up bravely and tell them to stop. This will help create a better atmosphere（气氛）at school. 

◆Try to deal with arguments between other kids. When you see other students in an argument，you can help deal with the problem. {#blank#}2{#/blank#}After all，many argument s in school are just misunderstandings between two people. 

◆{#blank#}3{#/blank#}If you know that other students have difficulty learning a subject that you're good at，you can help them by teaching them in that subject. Helping other students to improve their grades will help create a positive atmosphere in school. 

◆{#blank#}4{#/blank#}If you notice a student who doesn't have many friends or sits alone at lunch，make it a point to become their friend. {#blank#}5{#/blank#}So why not encourage other people to become friends with them？