California is the third largest state in the USA but has the largest population. It also has the{#blank#}1{#/blank#} of being the most multicultural state in the USA, {#blank#}2{#/blank#} people from all over the world. The customs and languages of the immigrants live on in their new home. This diversity of culture is not{#blank#}3{#/blank#} when you know the history of California.

    People from different parts of the world, attracted by the climate and the lifestyle, still immigrate to California. It is believed that before long the mix of nationalities will be{#blank#}4{#/blank#} great that there will be no distinct major{#blank#}5{#/blank#} or cultural groups, but simply a mixture of many races and cultures.

    Although at present human egg cells and embryos{#blank#}6{#/blank#} for cloning research are difficult to obtain, newspapers wrote of evil leaders{#blank#}7{#/blank#} to clone themselves to attain their ambitions. Religious leaders also raised moral questions. Governments became nervous and more conservative. Some began to reform their legal systems and{#blank#}8{#/blank#} research into human cloning, but other countries like China and the UK, continued to accumulate evidence of the {#blank#}9{#/blank#} medical aid that cloning could provide. However, scientists still wonder whether cloning will help or harm us and{#blank#}10{#/blank#} it is leading us.

    Two brothers, Herbert and James, lived together with a cat named Edgar.

    James {#blank#}1{#/blank#} (be) particularly devoted to the cat, and when he had to leave town for several days, he left Herbert careful {#blank#}2{#/blank#}(instruct) about the cat's care.{#blank#}3{#/blank#} the end of his first day away, James telephoned his brother ,“How is Edgar ?”He asked.

    “Edgar is {#blank#}4{#/blank#}(die),” Herbert answered. Then James said, “Herbert, you're insensitive(漠不关心的). You know{#blank#}5{#/blank#} close I was to Edgar. You should have broken the news to me {#blank#}6{#/blank#}(slow). When I asked about Edgar tonight, you should have said, 'Edgar's on the roof, but I have called the first department {#blank#}7{#/blank#} (get) him down.' And tomorrow when I called, you could have said the firemen were having trouble{#blank#}8{#/blank#} (take) the pet down, but you were hopeful they would succeed. Then when I called the third time, you could have told me that the firemen have done their{#blank#}9{#/blank#} (good), but unfortunately Edgar had fallen off the roof and was at the vet's(兽医站). Then when I called the last time, you could have said that {#blank#}10{#/blank#} everything possible had been done for Edgar, he had died. That's the way you should have told me about Edgar.”

    Brave and {#blank#}1{#/blank#}(intelligence), the tiny mouse from the US cartoon series Tom and Jerry is loved and remembered by fans worldwide.

    Recently, scientists from Britain and Canada have created super-clever mice by {#blank#}2{#/blank#}(change) a single gene (基因). In the study, {#blank#}3{#/blank#}(research) changed one of the mice's genes to stop the PDE4B enzyme (酶), a substance found in the human brain, {#blank#}4{#/blank#} working.

    After that, they ran several tests on the {#blank#}5{#/blank#}(behave) and found they tended to learn{#blank#}6{#/blank#}(fast), remember events for longer and {#blank#}7{#/blank#}(solution) difficult problems better than normal mice. The mice also suffered less anxiety (焦虑) and showed {#blank#}8{#/blank#} fear of cats, their natural enemy.

    A team from the UK's Leeds University is now trying developing drugs (药品){#blank#}9{#/blank#} could block the PDE4B enzyme. {#blank#}10{#/blank#}(hope), the drugs could help with treatments for brain conditions such as Alzheimer's disease (老年痴呆症).

    Everyone likes to have friends {#blank#}1{#/blank#} are trustworthy. When what we say matches what we do, we earn trust and friendship. On {#blank#}2{#/blank#} contrary, once we break our word, nobody will ever trust us again. For example, if you are {#blank#}3{#/blank#} untrustworthy worker, you are less likely {#blank#}4{#/blank#} (get) a promotion. Therefore, the {#blank#}5{#/blank#} (important) of keeping one's word cannot be stressed too much.

    I once had the unpleasant experience of someone breaking his promise to me. Last month, everyone in my class had to gather at school {#blank#}6{#/blank#} 6:30 am for our {#blank#}7{#/blank#}(graduate) trip. My friend Ben asked me to meet him at McDonald's at six, but he never showed up. I was {#blank#}8{#/blank#} (depress) that when I called him, he told me he was already at school. I {#blank#}9{#/blank#} (rush) straight there, but all my classmates still blamed me for delaying the trip. After that, I ended my{#blank#}10{#/blank#} (friend) with Ben because I don't need friends who can't keep their word.