In order to know a foreign language thoroughly, four things are necessary. Firstly, we must understand the language when we hear {#blank#}1{#/blank#} spoken.. Secondly, we must be able to speak it correctly with confidence and without hesitation. {#blank#}2{#/blank#} ,we must be able to read the language , and fourthly, we must be able to write it. We must be able to make sentences that are grammatically correct.

    There is no easy way to success {#blank#}3{#/blank#} language learning. {#blank#}4{#/blank#} good memory is of great help, but it is not enough only {#blank#}5{#/blank#}(memorize) rules from a grammar book. It is not much use learning by heart long list of words and {#blank#}6{#/blank#}meanings , studying the dictionary and so on. We must learn by using the language. {#blank#}7{#/blank#}we are satisfied with only a few rules we have memorized, we are not really learning the language. “Learn through use” is a good piece of {#blank#}8{#/blank#}(advise) for those {#blank#}9{#/blank#}are studying a new language. Practice is important. We must practise speaking and {#blank#}10{#/blank#}(write) the language whenever we can.

    Polar bears are suffering in a {#blank#}1{#/blank#} (warm) world.

    Polar bears live in environments too cold for most animals. {#blank#}2{#/blank#} much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared {#blank#}3{#/blank#} for the cold conditions. But nothing has prepared the bears for the danger that {#blank#}4{#/blank#} (threat)the only home they know.

    The polar bears' world is melting. Studies show that the polar ice has reduced by 9.8% every 10 years {#blank#}5{#/blank#} 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their {#blank#}6{#/blank#} (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher, {#blank#}7{#/blank#} scientist who studies North American polar bear populations. “{#blank#}8{#/blank#} it, they can't exist.”

    Some melting and refreezing of the polar ice is natural. {#blank#}9{#/blank#} in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later, {#blank#}10{#/blank#} the bears are not actively hunting.

    Which would you rather be, a mathematician or {#blank#}1{#/blank#}author? Perhaps you will never be {#blank#}2{#/blank#}(face)with this kind of choice. Lewis Carroll was a mathematician and author. He was a lecturer in mathematics at Oxford University. But he is{#blank#}3{#/blank#}(good)known as the writer of two of the most famous children's books {#blank#}4{#/blank#}have ever been written(Alice in Wonderland and Through the Looking Glass). The author's real name was Charles Lutwidge Dodgson, but he {#blank#}5{#/blank#} (prefer)to use the pen name "Lewis Carroll" when he wrote, and this is the name we remember him by. Alice in Wonderland, {#blank#}6{#/blank#} (publish)in 1865 when the author was 33 years old, was followed by Through the Looking Glass in in 1871. {#blank#}7{#/blank#} books were written for a real girl called Alice and they {#blank#}8{#/blank#} (read)by millions of children since they were first published. These stories are about a dream world in which Alice meets strange creatures and has {#blank#}9{#/blank#} (interest) adventures. I'm sure you know this already, {#blank#}10{#/blank#} if you don't, you'd better read the stories yourselves.

    Monkeys do not like it when others get more food {#blank#}1{#/blank#} they do, according to a new study.

    Researchers from Yale and Harvard universities found Capuchin monkeys punish monkeys {#blank#}2{#/blank#} get more food. "This sort of, 'If I can't have it, no one can' response is because {#blank#}3{#/blank#} psychological spite (怨恨), and it was{#blank#}4{#/blank#} (previous) thought unique to humans," said Kristin Leimgruber of Harvard University. She is a co-author of the research study. The researchers watched as some Capuchin monkeys {#blank#}5{#/blank#} (give) more food than others. They found that monkeys getting the {#blank#}6{#/blank#} (small) share pulled a rope to fold up a table holding the other monkey's bigger share.

    Another lead researcher, Laurie Santas, {#blank#}7{#/blank#} (explain) over email, "I think what we can conclude about humans is that some of our more embarrassing tendencies have relatively deep {#blank#}8{#/blank#} (root)." Santos said the spiteful response was not present with another member of the ape species—chimpanzees(黑猩猩).

    An earlier study, she said, showed chimpanzees would fold up the table of other chimpanzees {#blank#}9{#/blank#} (steal) food from them. But they would not punish chimpanzees who just happened {#blank#}10{#/blank#} (have) more food, Santos said. In other words, it was fine if another chimpanzee had more food as long as they did not steal it.

    The Beijing Vanke-Shijinglong Ski Resortis located{#blank#}1{#/blank#}Yanqing District, a national demonstration area for ecological construction. With Longqing Gorge to its east and Guanting Reservoir to its west, it has fresh air and an {#blank#}2{#/blank#}(impress) environment.{#blank#}3{#/blank#}(build) in 1999, it was the first large ski resort to be built near Beijing. In 2016, a massive renovation project {#blank#}4{#/blank#}(start) by Vanke, the Beijing Badaling Tourism General Company, and the original Beijing Shijinglong Ski Resort.

I was very frightened when{#blank#}1{#/blank#}(wake) up in hospital last Thursday. I fainted in my PE class because of low blood sugar levels. Fortunately, I was rushed to hospital{#blank#}2{#/blank#}(immediate). The doctor helped me and I made a full recovery within two days. My experience proves what a bad idea{#blank#}3{#/blank#}is to try to lose weight by skipping meals. Now I know this extreme weight-loss method has serious side{#blank#}4{#/blank#}(effect). Now I also understand that being healthy and{#blank#}5{#/blank#}(energy) is more important than being slim.

From now{#blank#}6{#/blank#}, I will pay more attention to my health rather than my weight. I will eat a{#blank#}7{#/blank#}(balance) diet to make sure I have enough nutrition. Exercising regularly is also{#blank#}8{#/blank#}important part of a healthy lifestyle. My doctor tells me that it will help me concentrate better in class. So, I{#blank#}9{#/blank#}(play) sport with my friends every other day after school, {#blank#}10{#/blank#}I hope can help me get into shape.