Which agreement rule applies to a singular collective noun functioning as a unit?
use a singular verb
use a plural verb
make the verb agree with the subject closest to the verb
use a plural verb if the collective noun uses and

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.

Those are books that need to be returned to the library what is the antecedent of the pronoun those

Which statement best describes the authors use of a claim and a counterclaim in the passage