Answer key to sample problems for test 2

Here's the key to the sample problems, I think.

1-A, 2-B, 3-A, 4-D, 5-C,
6-B, 7-B, 8-C, 9-E, 10-C 11-C,
12-C, 13-D, 14-C, 15-B,
16-C, 17-C, 18-D.