Define the following word using the meaning of the suffix. use your dictionary if you are uncertain of the definition. accelerator

person or thing that accelerates

Explanation:

The suffix -or is added to verbs to create nouns.

The nouns derived from these verbs denote ‘a person or thing that does ... ’ This is the meaning of the suffix -or.

Therefore, accelerator means person or thing that accelerates.  

right

explanation:

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.