Plethora would be the collective noun because it is a group.
Answer: 1.) polio , 2.) weaker, 3.) daily, 4.) he joined the Olympics , 5.) three events, 6.) all three events , 7.) gold medals , 8.) they dropped the hope, step, and jump from the events list. 9.) when he went to Asia, 10.) millions of years ago I believe, 11.) C , 12.) explains in passage , 13.) B , 14.) A , 15.) C , 16.) looked at the instructions
Explanation:
What the verbs fit, set, and read have in common is that they keep the same form no matter what tense is used.
You can say - I read a book every day. Or Those pants fit you nicely. Or I set the table often.
And if you want to say all that in the past tense, it would look the same:
I read a book yesterday. Those pants fit him nicely a long time ago. I set the table two days ago.
I believe it going to be A.