Question

15. They

the institute five years ago.
(A) have entered
(B) entered
(C) had entered
16. Does the professor _ a lot of experience?
(A) has
Ο Ο Ο
(B) have
(C) had

Answer 1

15. C // 16. B ; number 15 is in past tense while number 16 is in present tense

Answer 2

15.(C) and 16.(A) I think these are the correct answer hope it helps