A. off B. of C. safe D. knife
2. A. benches B. boxes C. watches D. tables
3. A. corn B. cut C. cat D. certain
4. A. cure B. during C. pull D. pure
5. A. study B. cut C. bull D. mud
6. A. pleasure B. sound C. same D. best
7. A. creative B. creation C. creature D. create
8. A. addition B. advance C. advertise D. advantage
9. A. enough B. though C. rough D. cough
10. A. laughter B. daughter C. taught D. caught
11. A. expectation B. introduction C. volunteer D. foundation
12. A. extensive B. exciting C. excellent D. existence
13. A. successful B. wonderful C. beautiful D. plentiful
14. A. university B. understand C. geography D. biological
15. A. mechanic B. official C. preference D. convenience