Not all memories are sweet. Some people spend all their lives trying to forget bad experiences.

    Now American researchers think they are close to developing a pill, {#blank#}1{#/blank#} will help people forget bad memories. The pill is designed {#blank#}2{#/blank#} (take) immediately after a frightening experience. They hope it might reduce, or {#blank#}3{#/blank#} (possible) erase (抹去) the effect of painful memories.

    In November, experts tested a drug on people in the U.S. and France. The drug stops the body from {#blank#}4{#/blank#} (release) chemicals that fix memories in the brain. So far, the research {#blank#}5{#/blank#} (suggest) that only the emotional effects of memories may be reduced, not that memories are wiped out. They are not sure to the degree people's memories are affected.

    The research has caused a great deal of {#blank#}6{#/blank#} (argue). Some think it is {#blank#}7{#/blank#} bad idea, while others support it. Supporters say it could lead to pills which prevent or treat soldiers' troubling memories after war. They say that there are many people who suffer from terrible memories. {#blank#}8{#/blank#}, those who are{#blank#}9{#/blank#} the research say that maybe the pills can change people's memories and changing memories is very {#blank#}10{#/blank#} (danger) because memories give us our identity.

    Climate change has caused a rise in sea levels. This has increased the amount of salt in fresh water {#blank#}1{#/blank#}(use) on coastal farms. As a result, farmers are {#blank#}2{#/blank#}(gradual) unable to use fields close to the sea. However, Marc Van Rijsselberg, a farmer in the Netherlands is now using a {#blank#}3{#/blank#}(mix) of sea and fresh water {#blank#}4{#/blank#}(grow) healthy and tasty vegetables.

    He teamed up with scientists from the Free University and divided a farm {#blank#}5{#/blank#}eight negated areas. Separate pipes pumped fresh and sea water, and a computer program created water with eight levels of salinity (含盐度).

    The water levels and the levels of salinity was {#blank#}6{#/blank#}(control) by computerized measuring devices called “sensors”. Mr. Van Rijsselberg said he was able to harvest vegetables from most of the eight testing areas. He said the vegetables were smaller than {#blank#}7{#/blank#} grown in fresh water. But he said they also had more sugar and salt, so they tasted much {#blank#}8{#/blank#}(good).

    He found that potatoes grew better than the other vegetables in the combination of sea and fresh water. Mr.Van Rijsselberg said four kinds of these potatoes would be sent to Pakistan {#blank#}9{#/blank#}thousands of hectares of land {#blank#}10{#/blank#}(damage) by salinization last year.

    At my first class in the Forks High School, Mr. Banner, my English teacher sent me to an empty desk at the back without {#blank#}1{#/blank#} (introduce) me to the class. It was harder for my new classmates {#blank#}2{#/blank#}(stare) at me in the back, but somehow, they managed. I kept my eyes down on the reading list the teacher had given me. It was {#blank#}3{#/blank#}(fair) basic: Bronte, Shakespeare, Chaucer, Faulkner. I'd already read everything. That was comforting… and boring.

    The Tower Bridge is one of the twenty-seven bridges over the River Thames. It is close to the Tower of London, from{#blank#}1{#/blank#}the Tower Bridge got its name. It is a symbol of London.

    It is recorded that the Tower Bridge {#blank#}2{#/blank#}(build) in 1894 and now it is one of the{#blank#}3{#/blank#}(famous) bridges in the world. It's interesting that its middle part can be raised{#blank#}4{#/blank#}(let) big ships pass. It used to be raised about 50 times a day, but now it is raised only 4 to 5 times a week. If you are lucky enough to see the bridge with its two arms open high in the air, you'll never forget it.

    People often think the Tower of London and the Tower Bridge are{#blank#}5{#/blank#}the same age. {#blank#}6{#/blank#}in fact, the Tower of London was built 1000 years ago, while the latter only{#blank#}7{#/blank#}(have) a history of over 100 years.

    The Tower Bridge was first painted chocolate brown. Later, it was painted red, white and blue. Its picture also appeared in the opening of the Summer Olympic Games{#blank#}8{#/blank#}(hold) in London in 2012. So come to visit the famous bridge. You'll{#blank#}9{#/blank#}(sure) have a wonderful experience and it'll leave you a lasting{#blank#}10{#/blank#}(impress).