If you go out to the fields at night spring or summer, you can hear singing 61 (happy)here and there. It seems as if they were performing a field concert.
The frog is a beneficial creature that does good to human beings. They can catch fast-moving insects. Each frog eats a large number of pets that are harmful to crops. This little creature is regarded 62 the natural enemy of pests.
But now the number or frogs 63 (become)smaller and smaller. This is 64 they are killed and put 65 the table as a delicious dish by their chief enemy, human beings. It is cruel, isn’t it? The cause of the rapid 66 (reduce)of frogs is that farmers use pesticide(杀虫剂)to kill pests ,and then frogs get 67 (kill)as a result of eating the poison-killed insects.
Something must be done without delay 68 (save)frogs. If we don’t punish those 69 sell and kill frogs to make money, then one day all of us 70 (punish)by nature for failing to save frogs.
61. happily 62.as 63.is becoming 64.because 65.on
66.reduction 67.killed 68.to save 69.who 70.will be punished