1. what is the complete subject of the sentence?

the laughing child ran quickly through the crowded playground.

a. the crowded playground

b .laughing child

c. the laughing child

d. ran quickly

The subject is the child. The complete subject is the child and the details about it. So the answer is C, the laughing child :)

Acquiring english is a way of learning where you learn english by birth, this includes listening to your parents, brothers and sisters and on the whole learning it from the environment around you while mastering standard english need qualified institutes and teachers who make certain programs and syllabus to you master the standard english. this also can include a long session of academic studies before you can master the standard english.standard english is necessary for literary works, official usage and writing materials for standardized publications or when someone needs to speak publicly. in most cases the employers of a company also demand and like the use of standard english from their employees.