Johnny Carson began his work in television {#blank#}1{#/blank#}his twenties. First he worked at local stations in Nebraska. Several years {#blank#}2{#/blank#} (late), he moved to Los Angeles, California. It was “The Tonight Show”{#blank#}3{#/blank#}made Johnny Carson famous for thirty years. He became {#blank#}4{#/blank#}most popular star of American television. He {#blank#}5{#/blank#}(call) “the king of late night.” Critics said Americans from all parts of the country liked him and felt they knew him.

    He did not take his fame {#blank#}6{#/blank#} (serious). For example, when asked how he became a “star”, he answered: “I started in a gas state and I cooled.” Carson's special skill was his sense of humor. Audiences laughed at his jokes he made at the{#blank#}7{#/blank#} (begin) of his show. However, sometimes they laughed even{#blank#}8{#/blank#}(hard) at the jokes that failed. He was the most{#blank#}9{#/blank#}(power) performer (表演者) on television. Many comedians (喜剧演员) and singers became successful after{#blank#}10{#/blank#} (appear) on “The Tonight Show”.

    I wonder if it is because I haven't been able to be outdoors for so long {#blank#}1{#/blank#}I have grown so crazy about everything to do with nature. I can well remember that there was a time{#blank#}2{#/blank#}a deep blue sky, the song of the birds, moonlight and flowers could never have {#blank#}3{#/blank#}(keep) me spellbound. That has changed since I came here. For example, one evening when it was so warm, I stayed {#blank#}4{#/blank#} (wake) on purpose until half past eleven in order to have a good look at the moon by myself. But as the moon gave far too much light, I didn't dare open{#blank#}5{#/blank#}window. Another time five {#blank#}6{#/blank#}(month) ago, I happened {#blank#}7{#/blank#}be upstairs until the window had to {#blank#}8{#/blank#} (shut). The dark, rainy evening, the wind, the thundering clouds held me {#blank#}9{#/blank#}(entire) in its power; it was the first time in a year and a half that I{#blank#}10{#/blank#}(see) the night face to face...

    Are people happier in nature with blue skies overhead and fresh green grass underfoot? Could noisy streets, {#blank#}1{#/blank#} (crowd) with cars and people, make us unhappy? The World Health Organization estimates that 54 percent of the world's population lived in urban areas in 2014. The WHO adds that that amount {#blank#}2{#/blank#} (increase) to 66 percent by 2050.

    People often move to cities for{#blank#}3{#/blank#} (good) jobs and more cultural activities. But are they putting {#blank#}4{#/blank#}(they) at risk?

    Experts say that natural environments or green spaces do a lot of good for our mental health.

    Many studies have shown that nature can calm us and make us feel happy. Nature, experts say, can also help us learn better. And {#blank#}5{#/blank#} (experience) nature helps people recover from the mental tiredness that {#blank#}6{#/blank#}(come) from day-to-day work.

Mental health experts say some research suggests that city living might hurt our mental health, {#blank#}7{#/blank#} they cannot say exactly why. “What are the specific{#blank#}8{#/blank#} (aspect) of the urban environment {#blank#}9{#/blank#}causes some people to develop mental health issues?” asked AndraMechelli, a doctor at Kings College, London.

    Researchers have found that being outdoors, seeing trees, hearing birdsong, seeing the sky, and being {#blank#}10{#/blank#}touch with nature are associated with higher levels of mental well-being.

    There are four ways {#blank#}1{#/blank#}which British and American English differ from each other. The first and most obvious way is in the vocabulary. There are a few {#blank#}2{#/blank#}(differ) in grammar, too. The British say Have you got…? {#blank#}3{#/blank#}Americans prefer Do you have…? The British use prepositions {#blank#}4{#/blank#}Americans sometimes omit them. The other two areas in which the two varieties are different are spelling and {#blank#}5{#/blank#}(pronounce). However, with communications {#blank#}6{#/blank#}(develop) {#blank#}7{#/blank#}(steady) for over a century, some experts believe that the two varieties {#blank#}8{#/blank#}(move) closer together due to satellite TV and the Internet. English {#blank#}9{#/blank#}(speak) with different accents; in the future, there are going to be many "Englishes". In spite of this, users of English will have no difficulty {#blank#}10{#/blank#}(understand) each other.