11. Human behavior is mostly a product of learning, ______the  behavior of animal depends mainly on instinct.

A. whereas

B. so

C. unless

D. that

12. Mumps ____ a very common disease which usually affects children.

A. was

B. is

C. are

D.were

13. The _____largest state is, and has been since Alaska's admission into the Union, Califoria.

A. three

B. third

C. first third

D. most

14. ________ the surface of metal, but also weakens it.

A. Not only does rust corrode

B. Not only rust corrode

C. Rust, which not only corrodes

D. Rust not only corrodes

15. It's nice to go for a walk __ a summer evening.

A. on

B. in

C. at

D. during

16. "Are these two issues settled?"

"No, they still were _____ conflict."

A. during

B. on

C. with

D. in

17. "Did the medicine make you feel better?"

"No, ______ the worse I feel."

A. taking more medicine

B. the most medicine I take

C. the more medicine I take

D. when I take more medicine

18. His health is _________.

A. as poor, if not poorer than, his sister

B. poor as his sisters if not poorer

C. as poor as, if not poorer than, his sister's

D. as poor, if not poorer than his sister's

19. Susanne had worked for three years to be a computer analyst but found her progress ________.

A. discouraging and unsatisfied

B. discourageable and dissatisfaction

C. discouraging an dissatisfaction

D. unsatisfactory and discouraging

20. That definition leaves _____ for disagreement.

A. much room

B. a small room

C. great deal room

D. not so big a room