Hearing is very important to all of us. We can 1beautiful music, nice songs of birds, the laughter of people or other different kinds of  2 in the world with our ears. 3 we must try to protect our ears. The following will tell you  4 protect ears.

    Listening to 5 usic a lot can be bad forears, especially when headphones are used. So 6 the volume(音) when you're wearing headphones or try not to wear headphones. You should give your ears a rest if you like wearing headphones.

    Before swimming, remember 7 earplugs （耳塞) into your ears or wear a swim hat to stop water from getting into your ears.

If you are going to a concert, wear earplugs to protect your ears 8 the terrible music! In fact, special earplugs can be made for you if you go to concerts a lot or if you are a musician yourself.

    See a doctor if your ears 9. Take some medicine if the doctor asks you to do so. Follow the advice above now and you won't be saying"what?"when you are getting 10.

The US public uses about 50 billion water bottles a year and most of those {#blank#}1{#/blank#} bottles are not recycled, according to Elizabeth Royte's book Bottlemanid: How Water Went on Sale and Why We Bought It.

More than $100 billion is spent every year on bottled water in the U.S. in many developing countries where there isn't a safe {#blank#}2{#/blank#} of tap water, bottled water is the only choice.

In the US, tap water is controlled by the government and often {#blank#}3{#/blank#} for dangerous substances(物质). Each American drinks 79 litres of bottled water per year {#blank#}4{#/blank#}. The bottled water industry is so successful that it has outpaced milk, coffee, and juice in the number of gallons of drinks sold – putting it behind only beer and soda.

    We live in computer age(时代). People 1 scientists, teachers, writers and even students use computers to do all kinds of work. But more than 30 years ago. 2 couldn't do much. They were very big and expensive. Very few people were 3 in them and knew how 4 them. Today computers are smaller and 5. But they can do a lot of work. Many people like to use them.

    Computers become very important because they can work 6 than people and make fewer mistakes. Computers can 7 people do a lot of work. Writers now use computers to 8. Teachers use them to help teaching. Students use them to 9. Computers can also remember what you 10 them. Computers are very useful and helpful. They are our friends. Do you want to have a computer?

    Can you imagine astronauts' everyday life in space? They also need to eat, 1, exercise and relax. They do the same things as us, but they do 2differently.

    On Earth, we put food on a plate and water in a glass. Gravity（重力）holds the food down and keep the water in the glass.3 there is almost no gravity in space, so food can float（漂浮） away，and astronauts must eat and drink 4.

    Sleeping is very different in space. Some astronauts like to float in the air, but most like to be in a 5bag. They tie（捆绑） the bag to a wall 6they won't float away at night.

    Exercise is very important in space. On Earth, your legs 7 your body, but in space, astronauts float. So they do not use their legs often. This is very 8their legs, they must exercise for thirty minutes every day.

    After a day's work, astronauts relax. They may listen to music, read, watch films, play games, or talk to their friends and families 9 the radio. Sometimes they just enjoy 10in the air.

    It's March 12^th. Li Li and Lin Tao are digging on a hill nor far from their school. In China, people across the country plant trees1on this day.

    The idea of planting trees was first put forward in 1911 by Sun Zhongshan, the great2 in China's history. He said more trees were needed as a3against flood(洪水)and drought. In 1915, April 5^th was named as Tree Planting Day. Then, in 1979, the day4to March 12^th, to 5the date on which Sun Zhongshan died.

    "Everyone has heard of the Great Wall of China," says Li Li. "But have you heard of the Green Wall of China? That's the biggest tree planting 6 of all. "The Gobi Desert in the north of China was 7every year. So in 1978, a tree planting project was started to 8 Gobi spreading. The government and local farmers have been planting millions of trees to build a great green "wall" along the edge of the desert.

    "Tree planting has become a tradition in China now," says Lin Tao. "Almost everyone does it on March 12th. Many people also plant a tree on a 9 day. My parents planted a tree when started school. And my cousin planted 10 on his wedding (婚礼) day. We do it for the environment and for ourselves."

    My name is Miranda Gibson. I have been at the top of a tree for five months now. Some people might wonder 1 on earth I would choose to do that.

    I have walked 2 this forest many times. On 12 December 2016, machinery (大型机械) rolled into the forest and the destruction (摧毁) began. I couldn't bear (忍受) the thought that these forests would be 3 forever. So, on 14 December 2016, I put my clothes into a bag, 4 my job plans, and climbed 60 meters to the top of this tree. I have been there ever since.

    Life in the tree tops can be challenging. I have times when I feel frustrated (沮丧的) and I wish I could 5 to have a holiday for a few days! There are times too, when I feel terribly 6. I miss my friends and family.

    Living on the tree has been exciting and encouraging. I am willing to 7 up here for a long time, 8 I honestly hope it won't be too 9 before I can put my feet on the ground below and stand in a forest that will never 10.