Which of the following single nouns does not form an irregular plural. a. tree b. tooth c. mouse d. ox

A. Tree is the only one that the plural of the word stays the same spelling and the entire word does not change. For example the plural of tooth is teeth, but the plural of tree is tree's.

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

b. brooks wrote about the same type of neighborhood in which she grew up.