If you had put them there already then those are correct
Answer:
<em>DEAR SIR/ DEAR MADAM YOURS FAITHFULLY </em>
<em>BRAINLY??</em>
<em>PLZ</em>
Explanation:
Seventy-two
Before:
Seventy-one
After:
Seventy-three
The sentence is imperative meaning the subject is (you)