Choices for 1st blank: a. CAF and EFA
b. GAC and DFE
c. CAF and EFH
d. GAB and EFA

choices for 2nd blank:
a. By the linear pair theorem
b. Because they are corresponding angles of parallel lines cut by a transversal
c. By the vertical angels theorem
d. By the transitive property of congruence

choices for 3rd blank:
a. addition
b. subtraction
c. substitution
d. transitive