My trip to Tibet is so wonderful that I {#blank#}1{#/blank#} {#blank#}2{#/blank#} to {#blank#}3{#/blank#} you of it.

    Beijing was once a city of bikes, known as the Bicycle Kingdom{#blank#}1{#/blank#} cars were reserved for official business and the politically powerful. However, decades of economic {#blank#}2{#/blank#} (grow) led to a huge flowing of cars in the city. Owning one became not just a marker of reaching the middle class but also a requirement for marriage. As the economy developed, autos pushed bikes off the roads{#blank#}3{#/blank#}(create) heavy pollution and miserable traffic.

    {#blank#}4{#/blank#} (fortunate), now Beijing may be returning to its roots. Thanks to about 20 technology companies, brightly colored shared bikes {#blank#}5{#/blank#} (flood) into Beijing in the last two years. Many local residents welcome the shared bikes {#blank#}6{#/blank#}the flexibility and freedom they offer. They pick up the bikes and then ride and drop{#blank#}7{#/blank#} off anywhere they like, locking the back wheel, with no need to find a fixed place.

    Analyses in China say it is three factors that contribute to bikes {#blank#}8{#/blank#} (increase) rapidly: a lot of cash looking for a home, a good idea and government support. “As the city's population grew, traffic jams got{#blank#}9{#/blank#}(bad).” Cai, the Ofo spokeswoman, said, “Shared bikes could solve the 'last mile' problem in{#blank#}10{#/blank#} environmentally friendly way.”

    Woodblock printing first appeared in the early Tang period. During the Song dynasty, the technique of block printing was very advanced. Books were {#blank#}1{#/blank#} (beautiful) printed. Even today the books{#blank#}2{#/blank#}(print) at the time are valuable and treasured by libraries and book collectors. 

    However, block printing {#blank#}3{#/blank#}(be) not very convenient. Every two pages of a book had to be carved on a woodblock, and a big book would require many blocks. Besides, there had to be large places for storing the books. {#blank#}4{#/blank#} (overcome) these shortcomings, Bi Sheng invented the movable type during the years between 1041 and 1048. One word was carved on one piece of clay, {#blank#}5{#/blank#} was hardened with fire. Then clay characters were set on {#blank#}6{#/blank#} iron plate according to the text of a book. Then ink was applied to them and {#blank#}7{#/blank#}(sheet) of paper spread over them, and the printing was done. Bi Sheng's invention made printing faster and {#blank#}8{#/blank#}(easy) than before. Later, movable type of metal and wood was made and widely used.

    The technique of printing was gradually known to other Asian countries and Europe. The great influence printing had {#blank#}9{#/blank#}the advance of civilization is too clear to need any {#blank#}10{#/blank#}(explain).

    Out of the 20 little things you've always wondered about, one of them {#blank#}1{#/blank#} (probable) has to do with the small {#blank#}2{#/blank#} (five) pocket on your jeans. By now, you might have given up on trying to use it since it's too small to fit anything you actually need. But why is it there in the first place? Well, today, it doesn't really serve {#blank#}3{#/blank#} purpose, but it used to in the late 1800s.

    Actually the small pocket is called a watch pocket because it was originally intended as a safe place for men to store their pocket {#blank#}4{#/blank#} (watch). It {#blank#}5{#/blank#} (date) back to Levis first ever pair of jeans, which hit the market in 1879.

    The Levi Strauss blog also pointed {#blank#}6{#/blank#} that originally, there were only four pockets on a pair of blue jeans, the watch pocket {#blank#}7{#/blank#} (include). "The first blue jeans had four pockets—only one in back and, in the front, two plus the small, watch pocket," the blog stated.

    So next time you find {#blank#}8{#/blank#} (you) standing casually with your thumb hooked in that small pocket, know that it originally {#blank#}9{#/blank#} (use) to store a pocket watch. And now that we've got to know the tiny jean pocket, find out {#blank#}10{#/blank#} blue is the most common color.