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#}  meaning, 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 practice speaking and {#blank#}10{#/blank#} (write) the language whenever we can.

    One day, Nick invited his friends to supper. He was cooking some delicious food in the kitchen. Suddenly, he {#blank#}1{#/blank#}(find) that he had run out of salt. So Nick called to his son, “Go to the village and buy some salt, but pay a fair price for it: neither too much {#blank#}2{#/blank#}too little.

    His son looked surprised. “I can understand why I shouldn't pay too much, Father, but if I can pay less,{#blank#}3{#/blank#}not save a bit of money?

    “That would be a very{#blank#}4{#/blank#}(reason) thing to do in a big city, but it could destroy a small village like {#blank#}5{#/blank#}(us), Nick said.

    Nick's guests,{#blank#}6{#/blank#}had heard their conversation, asked why they should not buy salt more cheaply if they could. Nick replied, “The only reason a man would sell salt{#blank#}7{#/blank#}a lower price would be because he was desperate for money. And anyone who took advantage of that situation would be showing a lack of respect for the sweat and struggle of the man who worked very hard to produce it.”

    “But such a small thing couldn't {#blank#}8{#/blank#}(possible) destroy a village.

    “In the beginning, there was only {#blank#}9{#/blank#}very small amount of unfairness in the world, but everyone added a little, always {#blank#}10{#/blank#} (think) that it was only small and not very important, and look where we have ended up today.”

    In 1940, four teenage boys and their dog were walking through woodland close to Lascaux, when their dog suddenly disappeared. The boys searched all around. They came to a cave and looked into the cave{#blank#}1{#/blank#} could see nothing.

    A few days later, the boys returned to the cave. They could hardly believe {#blank#}2{#/blank#}eyes. In the weak lamplight, the boys saw red horses and cows, and black bulls and deer charging across the walls of the cave, which looked so {#blank#}3{#/blank#}(frighten) that the boys jumped back in fear. Little did the boys know that they had made one of the most important{#blank#}4{#/blank#}(discover) of that century.

    The Famous Lascaux Caves consist of a large hole and{#blank#}5{#/blank#} series of connecting caves, with a natural water system. The paintings there were an especially important find because they are so numerous and so well preserved. After a few years, the caves were opened{#blank#}6{#/blank#} a tourist attraction, and 1,200 people per day came to the site{#blank#}7{#/blank#}(admire) the paintings{#blank#}8{#/blank#} (fortunate), many visitors resulted in changes in the cave's atmosphere, and green algae (水藻) began to grow around the walls. Since then, the caves {#blank#}9{#/blank#}(close) to the public in an effort to conserve the fragile paintings in this precious underground site.

    Today, the caves have computer-controlled air-conditioning and are inspected daily. Scientists hope that these precautions will prevent any{#blank#}10{#/blank#}(far) damage to the paintings.

    China reached a milestone in space exploration on January 3, 2019. Chang'e-4 {#blank#}1{#/blank#} (successful) landed on the far side of the moon's surface.

    This is the first time in history{#blank#}2{#/blank#} any country has performed a soft landing on the back of the moon. It is also a huge win for Chinese scientists who have been planning out this work for {#blank#}3{#/blank#} (year).

    Shortly after the lander's arrival, it sent back a photo of the Yutu rover (月球车) {#blank#}4{#/blank#} (roll) slowly across the moon's dusty surface. As{#blank#}5{#/blank#} (expect), the lander will conduct a number of challenging tasks. It will observe the low-gravity environment and explore {#blank#}6{#/blank#} there is water or other resources. Later, soil samples{#blank#}7{#/blank#} (collect) and returned to the earth. Scientists believe that the back of the moon is {#blank#}8{#/blank#} (ancient) than the front, so the soil age is valuable for studying the early history of the moon.

    Since the far side of the moon is quiet and free {#blank#}9{#/blank#} electromagnetic interference (干扰) from the earth, it's a perfect place to research the space environment. Everything {#blank#}10{#/blank#} (appear) to be working smoothly, and we can expect plenty of moon news out of China in the near future.

    One of the biggest challenges {#blank#}1{#/blank#} (face) students today is how to concentrate on studies. Almost all of them are struggling for their concentration power. In an age {#blank#}2{#/blank#} mobile phones and Internet are eating up most of our time and energy, one can understand how different it is to focus attention and energy on studies.

    One of the most important {#blank#}3{#/blank#} (factor) for developing concentration on a task, whether it is study or anything else, {#blank#}4{#/blank#} (be) to develop an interest in that task. We are able to focus {#blank#}5{#/blank#} (easy) and more long periods of time on tasks that we find more interesting. If you ever want to concentrate on anything and studies are no {#blank#}6{#/blank#} (except), you need {#blank#}7{#/blank#}(ensure) that the environmental around you is distraction (注意力分散) free. So the question is not how to concentrate on studies {#blank#}8{#/blank#} how to avoid distractions that have swallowed up mankind today. The only way to guarantee {#blank#}9{#/blank#} distraction free environment is by getting rid of all the unnecessary things around you, including the electronic gadgets (小器具) {#blank#}10{#/blank#} mobile phones.