A. social B. clutch C. repetitive D. absence A. particle B. crater C. breakdown D. compile A. meanwhile B. wane C. unacceptable D. South Pole A. tradition B. regularity C. meteorologist D. lash A. betray B. east C. chimp D. space flight A. sixth B. unsettle C. axe D. sigh A. find out B. publication C. industriousness D. human A. invisible B. shatter C. pigeon D. March A. goes B. so far C. accountant D. build sb up A. continuously B. Internet C. thousand D. stubborn