Question 1
正确答案: insects
Question 2
正确答案: behaviour|behavior
Question 3
正确答案: father
Question 4
正确答案: complex|complicated
Question 5
正确答案: reproduction|breeding
Question 6
正确答案: control
Question 7
正确答案: duck|ducks
Question 8
正确答案: language
Question 9
正确答案: food
Question 10
正确答案: cost|costs|price|prices|bill|bills