Question 37: Mary’s room is dirty. It is messy too. (not only.....but)
=>Not only Mary's room dirty but it also messy.
Question 38: The old house burned down last week. No one lived there. (where)
=>The old house where no one lived burned down last week.
Question 39: I don’t know anything about plumbing. I can’t fix the leak in the sink myself. (if)
=>If I knew something about plumbing, I could fix the leak in the sink myself.
Question 40: The dates of the exam need to change. All students can take it. (in order)
=>The dates of the exam need to change in order that all students can take it.