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.

    Two traveling angels stopped to spend the night in the home of a wealthy family. The family was rude and refused{#blank#}1{#/blank#} (let) the angels stay in the guest room. Instead the angels{#blank#}2{#/blank#}(give) a space in the cold basement. {#blank#}3{#/blank#}midnight the older angel saw a hole in the wall and repaired it. When the younger angel asked why, the older angel replied: Things aren't always what they seem.

    {#blank#}4{#/blank#} next night the two angels came to rest at the house of a very poor, but very hospitable(好客的)farmer and his wife. After sharing their food, the couple let the angels sleep in their only bed .As {#blank#}5{#/blank#}(usually), the angels found the farmer and his wife in{#blank#}6{#/blank#} (tear). Their only cow died. The younger angel was very angry and asked the older angel, "Why did you not care about the poor family? The first man had everything, yet you watched over his house. The second family had little but was willing to share everything, but you did not help."

    {#blank#}7{#/blank#} (final)the older angel replied. "When we stayed in the basement, I noticed there was gold kept{#blank#}8{#/blank#} the hole . Since the owner was so greedy and unwilling to share his good fortune, I asked God if I could seal(封口) the wall so he wouldn't find it. Then last night as we slept in the farmer's bed, the angel of death(死神) came for his wife. I made up {#blank#}9{#/blank#}mind to help them, so I gave him the cow instead of the farmer's wife. Just remember that things aren't always {#blank#}10{#/blank#}they seem."

    Before the invention of the postage stamp, it was difficult to send a letter to another country. The sender paid for the letter {#blank#}1{#/blank#} (travel) in his or her own country. Then the person in the other country paid for that part of the trip.{#blank#}2{#/blank#} a letter crossed several countries, the problem was {#blank#}3{#/blank#} (bad).

    Rowland Hill, a British teacher, had the idea of a postage stamp with glue on the back. The British post office made the first stamps {#blank#}4{#/blank#} 1840.They were the Penny Black and the Twopence Blue. A person {#blank#}5{#/blank#} (buy) a stamp and stuck it on a letter. The post office delivered {#blank#}6{#/blank#} letter. When people received letters, they didn't have to pay anything. The letters were prepaid.

    Postage stamps became popular in Great Britain {#blank#}7{#/blank#} (immediate).Other countries started making {#blank#}8{#/blank#} (they) own postage stamps very quickly. Today, post offices in every country sell beautiful stamps.{#blank#}9{#/blank#} (collect) stamps is one of the most popular {#blank#}10{#/blank#} (hobby) in the world, and every stamp collector knows about the Penny Black and the Twopence Blue.

    One day, a father and his son were walking with their horse. An old man saw them and said, "You {#blank#}1{#/blank#}(suppose) to ride a horse, not to walk it!" The father then put his son on the horse.

    Soon they passed a group of people, {#blank#}2{#/blank#}said, "That's a lazy boy! He gets to ride the horse while his father walks." The father decided to take his son off and get on the horse himself. {#blank#}3{#/blank#}they kept going, they came upon two {#blank#}4{#/blank#}(passer-by). One said, "You are a {#blank#}5{#/blank#}(self) man! Your son has to walk while you get to ride!" The man then reached down and put his son on the horse with him.{#blank#}6{#/blank#}a while, they entered a town. Everyone started to laugh at them,{#blank#}7{#/blank#}(say), "You are too heavy for that horse!" The father and his son didn't know what {#blank#}8{#/blank#}(do).

    Finally, they decided to carry the horse. When they came to a bridge, the horse {#blank#}9{#/blank#}(fall) to the water. "If you try to please {#blank#}10{#/blank#}," the father told his son, "in the end, you will please no one." Then they went home.