First of all identify how many things u have to do. You have to do 4 things. I have written it for u in the attached pic.
Secondly, the paper has given examples on linking verbs at the top of your worksheet, use that as a clue. didn't see the word 'of' stated as a linking verb.
Finally, if you do get any wrong , do notify me, I'm interested to know.
If u have any questions u can ask.