The vowel sound in "cool" is a long vowel sound, pronounced /u:/ as in "food."
It is held longer than the short /u/ sound.
While a period ends a sentence, a comma indicates a smaller break. Some writers think of a comma as a soft pause—a punctuation mark that separates words, clauses, or ideas within a sentence.
A prefix is a group of letters added at the beginning of a word to change its meaning.
"un-" is a prefix meaning "not" (e.g., unhappy = not happy)
An affix is a word part added to the base form of a word to change its meaning.
It can be a prefix (before the base) or suffix (after the base).
The prefix "re-" means again, which fits the sentence meaning: look at this chapter again.
So, "review" means to go over or examine something again.
The prefix dis- means "not" or "opposite of".
So disused means no longer used.
Adding the suffix "age" to "wreck" forms "wreckage," meaning the remains of something destroyed.
"Age" is a common suffix used to form nouns indicating a result or outcome.
"Climbed" is pronounced as /klaɪmd/, where the "-ed" sounds like a /d/.
"Climd" phonetically matches this pronunciation (silent "e").
The prefix "dis-" means opposite of or not, and when added to "agreement", it becomes "disagreement".
"Disagreement" means a lack of agreement or conflict in opinion.