Answer:
C.
11. if i (will read) books my vocabulary (will expand)
12. if i (practiced) speaking englisb i (will improve)
13. i (will learn) korean culture if i (watched) k-dramas
14. if i (recieved) your email, i (will write) back to you
15. i (will listen) to my favorite song if i (wanted) to improve my mood
D
16. incorrect
17. correct
18. correct
19. correct
maybe some of it is wrong so please double check <3
