Answers:

Part 1

1-5 E C E C D
6-8 B A A

PART 2

9-10 C E
11-14 F B G A

Part 3

15C
16-20 D A D B C

Part 4

21-25 B D D A B
26-30 C A B C D

Part 5

31FROM
32AS
33ALTHOUGH/THOUGH/ WHILE/WHILST
34-35 WHERE SUCH
36-40 HOW WITH WHICH ON IF

PART 6

41-45? ALSO BY WHOLE CORRECT BUT
46-50 EVEN OF CORRECT THE ON
51-52 CORRECT CORRECT