If you go out to the fields at night in spring or summer, you can hear frogs singing{#blank#}1{#/blank#}(joy) here and there. It seems as if they were performing a field symphony（交响乐）.

    The frog is a good and useful creature that benefits human beings. They can catch fast-moving insects. Each frog eats a large number of pests that are {#blank#}2{#/blank#}(harm) to crops. This little creature is regarded {#blank#}3{#/blank#}“the natural enemy of pests”.

    {#blank#}4{#/blank#} now frogs are getting fewer and fewer. This is{#blank#}5{#/blank#}they are killed and put on the table as a delicious dish by their chief enemy, human beings. It is a shameless and cruel act, isn't it? Another reason responsible for the rapid reduction of frogs is {#blank#}6{#/blank#}farmers use insecticides (杀虫剂) to kill pests and frogs get {#blank#}7{#/blank#}(kill)as a result of drinking poisoned water or eating poison-killed insects.

    Something must be done without delay {#blank#}8{#/blank#}(save) frogs. If we don't punish those {#blank#}9{#/blank#}sell and kill frogs to make money, then one day all of us {#blank#}10{#/blank#}(punish) by nature for failing to keep the balance of nature.

    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.”

    Chinese Kung fu is a{#blank#}1{#/blank#}(tradition) Chinese culture. It is probably one of the earliest sports that use both{#blank#}2{#/blank#}(strong) and brain.

    The theory of kung fu is based{#blank#}3{#/blank#}classical Chinese philosophy. Over its long history it has developed as a unique combination of exercise, practical self-defense, self-discipline, and art. It can date back to ancient times{#blank#}4{#/blank#}people used sticks to fight against wild animals and they gradually{#blank#}5{#/blank#}(gain) experience in self-defense.

    Chinese kung fu is a large system of theory and practice,{#blank#}6{#/blank#}(combine) techniques of self-defense and health-keeping. In sports like track and field and boxing, an athlete{#blank#}7{#/blank#}(usual) has to retire from full participation in his 30s. That is because{#blank#}8{#/blank#}(injury) suffered during years of active sport participation at a young age affect our ability to continue exercising in later life. In Chinese kung fu, however, a difference{#blank#}9{#/blank#}(make) between "external"(外部的) and "internal"(内部的) kung fu. It's said that in external kung fu, you exercise your muscles, bones and skin while in internal kung fu, you train your spirit, qi and mind. So the external body weakens later in life, but on{#blank#}10{#/blank#}contrary, internal kung fu continues.

    We were studying Shakespeare's Romeo and Juliet in the class. Each of us {#blank#}1{#/blank#} (require) to play a scene from the play, and I {#blank#}2{#/blank#} (joke) asked to play the nurse. How the classmates responded aroused my interest. They thought I, a guy, couldn't play the nurse. But I decided I was going to be the {#blank#}3{#/blank#} (good) nurse to explode on the stage of the class. That fateful week, I imprinted the lines of the nurse in my head. On the day of the {#blank#}4{#/blank#} (perform), I walked onto the stage, {#blank#}5{#/blank#} (dress) in my grandmother's Italian suit, and poured my heart and soul {#blank#}6{#/blank#} the scene. {#blank#}7{#/blank#} look of astonishment on my classmates' faces was all I needed to realize what school {#blank#}8{#/blank#} (mean) to me. School was a place {#blank#}9{#/blank#} I could explore unknown areas of my mind and uncover new ideas about the world. Perhaps this realization had never shown {#blank#}10{#/blank#} (it) before, because I never been brave enough to uncover it.

Are you on{#blank#}1{#/blank#} diet? Then maybe you should consider{#blank#}2{#/blank#}(sit) by the window the next time you eat out. A new book claims that{#blank#}3{#/blank#}you sit in a restaurant can affect how much you consume.

A new research found that people sitting farthest from the front door ate the fewest salads and were 73 percent{#blank#}4{#/blank#}(likely) to order dessert.

The diners{#blank#}5{#/blank#}(seat) at a dark table ate heavier food and ordered more of it, {#blank#}6{#/blank#}those sitting at bright bar tables ordered more salads and fewer desserts.

According to the researchers, the darker it is, the more invisible you {#blank#}7{#/blank#}feel, the less easy it is to see how much you're eating and the less guilty you are when you eat more.

In contrast, {#blank#}8{#/blank#}(expose) yourself to the sunlight, people or trees outside might make you more aware {#blank#}9{#/blank#} you look, might make you think about walking or might make you want a green salad.

The researchers also noted that slim diners chewed around 15 times per mouthful, three chews more than heavier diners. By eating more slowly, the diner consumes less in the time{#blank#}10{#/blank#} takes for the brain to register satisfaction.