There are a lot of colorful flowers on side of the street.A. allB. bothC. either D. every

问题补充：

There are a lot of colorful flowers on side of the street.

A. all

B. both

C. either

D. every

答案：

A. all

B. both

(答案→)C. either

D. every

解析：街道只有两边，all表示三者或三者以上都，both两者都，后面要用复数名词，either两者中任何一个，every三者或三者以上中每一个。所以选C。