Read the excerpt from "Tools of the Spymaster." Washington, a spymaster with a sharp eye for details, gave exact instructions on how an agent should use invisible ink: "[H]e should occasionally write his
information on the blank leaves of a pamphlet... a common pocket book, or on the blank leaves at each end of registers, almanacs, or any new publication or
book of small value." He also told his agents that a "much better way" is to write a letter "with some mixture of family matters" and the secret message, which
would be invisible, "between the lines and on the remaining part of the sheet."
What is the author's main purpose in the excerpt?
O A. to inform readers about George Washington's stealth and creativity
O B. to persuade readers that spying during wartime is heroic
O C. to teach readers about the dangers of being a spy
O D. to compare various methods of writing secret messages

answer: the correct answer is b. an essay that connects the writer's experience with a topic of significance and of reader interest.

explanation: the key words are here "personal experience" since personal essays give insights about peoples' experiences in life and introduce us in their unique world that can be or not to related to our lives but interests us because we are human beings and share the same condition universally.  

the answer is:

when will (v) the books (n) be (v) due?

nouns refer to people (other than pronouns), places and things, whereas verbs describe actions and are usually part of the predicate of a sentence. finally, pronouns can work as nouns and identify the participants in speech.

in the example sentence, "will" is a verb part or auxiliary verb, "be" is an infinitive verb and "books" is a plural noun.

the answer is b to the question

even though there may be variations in human emotions over time, the poem “ a contribution to statistics” by wislawa symborska suggests that the only unchangeable characteristic is mortality.

the author poses a distinction between the approximate and non-approximate numbers which correspond to our need for certainty in life and the difficulty of achieving it. our efforts to measure the exact often fail because the world is not always clearly structured .the poem seems to imply   that the only thing that is certain and has an exact number is death.