A. systematic B. conflict C. defend against D. boxing A. signal B. themselves C. pulse D. behind A. door B. humorous C. stressful D. scratch A. buffet B. ripen C. owner D. share with A. over and over again B. surgeon C. Christmas tree D. hammer A. interrupt B. bachelor C. get in touch with D. beard A. scrape B. little by little C. tell a lie D. preference A. service B. chess C. archaeological D. milkweed A. until B. kindergarten C. independent D. curiously A. jacket B. junk C. bead D. watch out