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閱讀下面材料,在空白處填入適當的詞(1個單詞)或用括號內單詞的正確形式填空(不超過3個單詞)。

If you go out to the fields at night in spring or summer, you can hear frogs singing 1.____ (happy) here and there. It seems as if they were performing a field group singing.

The frog is a good and useful creature that benefits human beings. They can catch fast-moving 2.__ (insect). Each frog eats a large number of pests that are harmful to crops. This little creature is regarded 3.____ “the natural enemy of pests”.

But now frogs 4.___ (get) fewer and fewer. This is because they are killed and put 5.___ the table as a delicious dish by their chief enemy, human beings. It is a shameless and cruel act, isn’t it?

The cause responsible for the rapid 6.__ (reduce) of frogs is that farmers use insect killer to kill pests and frogs get killed as a result of drinking poisoned water while 7. __ (eat) poison-killed insects.

Something must be done without delay 8.__ (save) frogs. If we don’t punish those 9.____sell and kill frogs to make money, then one day all of us 10.__ (punish) by nature for failing to keep them.

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