The answer to the question that is being presented above would be the first choice which is '<span> Find costumes and make sure sets are complete. 2. Rehearse. 3. Select show dates. 4. Sell tickets.'. It makes the most sense because you select the show dates before you can sell tickets.</span>
C has a verb error. It should be "The magician might fall if he does the trick improperly." At least, I think so.
I think it is <span>A. </span><span>adjective clause</span>. Because we have here relative pronoun "who" that plays a role of a subject.
Answer:
11. Leroy added the last piece of the puzzle.
12. A cake was baked by my mother yesterday.
13. The gate was guarded by Sir Gawain and his servant.
14. She was not beat by me.
15. This experience will not be forgotten by me.
16. I dont know this one, Sorry.
17. I dont know this one either.
18. The police caught the thief.
19. The birds ate Mr. Harvey's entire stock of seed corn.
20. I dont know this one either