Answer:
a. a and 70º are Supplementary angles (add up to 180º)
Therefore,

b. a and 25º are Complementary angles (add up to 90º)
Therefore,

c. c and 65º are Supplementary angles (add up to 180º)
Therefore,

d and 65º are opposite angles, therefore

c and e are opposite angles, once
,
as well.