A. protect B. circulate C. volume D. organize A. explorer B. let down C. contribution D. nature A. Greece B. no way C. wood D. bronchitis A. cement B. post office C. two D. bamboo A. earth B. hard C. as good as D. after A. mistake B. basketball C. T-shirt D. sky A. get along B. fur C. crime D. psychology A. seminar B. cosmonaut C. whale D. rhythm A. concoct B. controversial C. surface D. logical A. southwest B. precaution C. infect D. breath