閱讀下面材料，在空白處填入適當?shù)膬热荩?個單詞）或括號內單詞的正確形式。

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

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 2. (harm) to crops. This little creature is regarded 3. “the natural enemy of pests”.

4. now frogs are getting fewer and fewer. This is 5. 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 6. farmers use insecticides (殺蟲劑) to kill pests and frogs get 7. (kill)as a result of drinking poisoned water or eating 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 the balance of nature.

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