问题补充：
If you go out to the fields at night in spring or summer, you can hear frogs singing 【小题1】 (joy) here and there. It seems as if they were performing a field symphony.
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 harmful _【小题2】 crops. This little creature is regarded 【小题3】_ “the natural enemy of pests”．
【小题4】_ now frogs are getting fewer and fewer. This is because they are killed and put on the table as a delicious dish by their chief enemy, human beings. It is 【小题5】 shameless and cruel act, isn’ t it？_【小题6】_ cause responsible for the rapid reduction of frogs is that farmers use insecticides (杀虫剂) to kill pests and frogs get killed as a result of drinking poisoned water 【小题7】_ eating poison-killed insects.
Something must be done without delay _【小题8】_(save) frogs. If we don’t punish those 【小题9】_ sell and kill frogs to make money, then one day all of us 【小题10】(punish) by nature for failing to keep the balance of nature.joyfully
答案：
(答案→)joyfully
解析：
【小题1】[解析]副词修饰动词。[答案]joyfully
【小题2】[解析]be harmful to“对……有害”，固定搭配。[答案]to
【小题3】[解析]be regarded as“被认为是……”。[答案]as
【小题4】[解析]与上文是转折关系，且后面没有逗号，故用But。[答案]But
【小题5】[解析]根据语意“这是一种不知羞耻的残忍的行为”，可知此处应用不定冠词。
[答案]a
【小题6】[解析]上面讲到的“吃”青蛙是它数量减少的一个原因，这里是“另一个”原因。
[答案]Another
【小题7】[解析](另一个原因是)青蛙喝了有毒的水，或者吃了被毒死的昆虫。二者是选择关系。 [答案]or
【小题8】[解析]为了保护青蛙，要刻不容缓地采取行动。不定式表目的。
[答案]to save
【小题9】[解析]定语从句，由于先行词是those，指人，故用who引导。[答案]who
【小题10】[解析]根据语境此处用一般将来时的被动语态。
[答案]will be punished
