His parents won't {#blank#}1{#/blank#} {#blank#}2{#/blank#} him {#blank#}3{#/blank#} to study in the USA alone.

    The history of Chinese currency covers more than 3,000 years. Currency of some type has been used in China since the Neolithic age (新石器时代), {#blank#}1{#/blank#} can be traced back to between 3,000 and 4,500 years ago. Cowry shells (贝壳) are believed to have been the {#blank#}2{#/blank#} (early) form of currency used in Central China, and were used during the Neolithic period. The use of shell money is confirmed in the Chinese writing system. The traditional {#blank#}3{#/blank#} (character) for “goods”, “buy” and “sell”, in addition to other {#blank#}4{#/blank#} (vary) words relating to exchange, all contain the “shell”.

    Around 210 BC, the first emperor of China Qin Shi Huang (260 — 210 BC) abolished all other forms of local currency and introduced{#blank#}5{#/blank#} uniform copper coin. Although paper money {#blank#}6{#/blank#} (invent) in China in the 9th century, the base unit of currency remained the copper coin. Copper coins were used{#blank#}7{#/blank#} the chief currency in China until the {#blank#}8{#/blank#} (introduce) of yuan in the late 19th century.

    Currently, the RMB is the official currency of China. With over 1.3 billion people {#blank#}9{#/blank#} (use) RMB every day, it is one of the most commonly used currencies in the world. Nowadays, online payment is taking a large share in the market. Will paper money disappear one day like shells or copper coins {#blank#}10{#/blank#} (replace) by a new way of payment? Only time can tell.

It is widely accepted that optimistic attitudes promote health as well as happiness. The secret of a long life is {#blank#}1{#/blank#} (universe) desired and has long been sought. Today we can reveal it: always look on the bright side. A huge research project {#blank#}2{#/blank#} (lead) by scientists at the Boston University School of Medicine concludes that optimists live {#blank#}3{#/blank#} (long).

Lewina Lee, lead author of the study, said, "A lot of evidence {#blank#}4{#/blank#} (suggest) that exceptional longevity(长寿) is widely accompanied by a longer span of good health and living {#blank#}5{#/blank#} disability. Therefore our findings raise an exciting possibility {#blank#}6{#/blank#} we may be able to promote health and happiness by {#blank#}7{#/blank#} (develop) positive attitudes such as optimism."

However, the study doesn't suggest that we should aim for great pleasure. Sadness is {#blank#}8{#/blank#} important part of the human condition. Any normal person sometimes experience disappointment, ambitions and the {#blank#}9{#/blank#} (lose) of loved ones. But for many people, these matters of human existence {#blank#}10{#/blank#} (transform) into an abnormal state of despair. There is a vital place in public health for providing mental treatment in helping to correct these cognitive errors. It is not weakness to be defeated by setbacks. It is merely a mistake.