The punctuation mark that often introduces a list of items is called a select one: hyphen. ellipsis colon. asterisk.

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.

the narrator closes the lantern tightly so the old man is

not awakened by the bright light

explanation: