1 C
2 C
3 A
4 C
5 C
6 B
7 C
8 A
9 A
10 C
11 A
12 B
13 A
14 B
15 Don't Know
16 D
17 B
18 D
19 A
20 B

21 B (any river with 7 letters in it's name is always a good bet!)