In the distant past, friend relied on each other for their survival. They hunted together and defended each other against {#blank#}1{#/blank#}(danger) animals and enemies. In those days, if you didn't have a friend, you would either starve, be eaten {#blank#}2{#/blank#} killed. Nowadays, friendship isn't {#blank#}3{#/blank#}(exact) a matter of life and death. However, friendship is still of great importance and not having a friend is something to be {#blank#}4{#/blank#}(concern) about. Most people look upon friends as someone they can depend on when they are going {#blank#}5{#/blank#}times of trouble. In such times, friends provide them with emotional support and sometimes financial help. It is in these troubled times {#blank#}6{#/blank#} they find out who their true friends are. As an old saying {#blank#}7{#/blank#}(go), in times of prosperity, friends will be plenty; in times of {#blank#}8{#/blank#}(suffer), not one in twenty. And there is another saying {#blank#}9{#/blank#} says you can hardly make a friend in a year, but you can easily upset one in an hour. So do your best to get along with and be grateful to all those {#blank#}10{#/blank#} are willing to side with you even when you are in the wrong as they are true friends and they are not easily come by.

    Success never comes easy. How many of you have heard of successful people who haven't made any effort? People often have to overcome failures {#blank#}1{#/blank#}they can accomplish something great. They usually don't find success from the very beginning.

    Van Gogh sold only one painting during his lifetime, but this didn't stop him from completing over 800 painting. Thomas Edison {#blank#}2{#/blank#}(fire) from his first two jobs for lack of competence. Later, as an inventor, he tried 1,000 times {#blank#}3{#/blank#}(create) the light bulb, without success. He was confident in {#blank#}4{#/blank#}(he), and{#blank#}5{#/blank#}(eventual) he did success. When {#blank#}6{#/blank#} (ask), “How did it feel to fail 1,000 times?” Edison replied, “I didn't fail 1,000 times. The light bulb was {#blank#}7{#/blank#} invention with 1,000 steps.

    These successful people have set good {#blank#}8{#/blank#}(example) to us. They wouldn't have achieved their success if they{#blank#}9{#/blank#}(abandon)their dreams. Believe in yourself and try your best, and success will not be far{#blank#}10{#/blank#} you.

    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.

    Every year around Valentine's Day, men begin to worry about what {#blank#}1{#/blank#} (present) to buy and women {#blank#}2{#/blank#} (fill) with hope and expectation. Or the other way around. In China, more couples get married on that very day, {#blank#}3{#/blank#} (add) romance to their promises. But for many, love is neither the matter-of-course choice {#blank#}4{#/blank#} the preferred one. More young, working urban residents are delaying or even choosing not to {#blank#}5{#/blank#} (active) seek their partners despite the social pressure from the older generations to do so.

    Over the years, China's divorce rate has exceeded (超过) that of marriage. According to the statistics from the Ministry of Civil Affairs, 10 million couples registered for marriage in 2017 fell by 7% {#blank#}6{#/blank#} (compare) with the same period last year, while 43.7 million couples divorced, 5.2% more than the same period last year.

    There is also a growing trend towards people marrying later: since 2013, the number of couples aged 25 to 29 has been greater than {#blank#}7{#/blank#} of younger couples. In the {#blank#}8{#/blank#} (late) survey on professional attitudes towards love and marriage, more than half of the investigated in Yangzhou, {#blank#}9{#/blank#} second-level city on the East coast, were satisfied {#blank#}10{#/blank#} their marriage after 35.

    Not all memories are sweet. Some people spend all{#blank#}1{#/blank#}lives trying to forget bad experiences. Now American researchers are developing a pill,{#blank#}2{#/blank#}will help people forget bad memories. The pill is planned to be taken immediately after a{#blank#}3{#/blank#}(frighten) experience. They hope it might reduce, or possibly erase, the effect of painful memories.

    However, the new research has caused a lot of argument. Supporters say bad memories may ruin people's lives. They come back{#blank#}4{#/blank#}us when we don't want to have them in a daydream or nightmare(噩梦). They usually come with very painful feelings. The pill can help to reduce many{#blank#}5{#/blank#}(suffer). But those{#blank#}6{#/blank#}are against the research say that changing memories{#blank#}7{#/blank#}(be) very dangerous because memories show who we are.

    {#blank#}8{#/blank#}the drug could first be used in only very serious cases, some people even fear that it would become more commonly used. Don't forget people always have the ability{#blank#}9{#/blank#}(use) science for the wrong purpose. What we should do is help people to have{#blank#}10{#/blank#}(good) control of memories.