A. space travel B. self-discipline C. underwear D. vacation A. salt B. steep C. slavery D. strong A. grass B. hear from C. fit D. infectious A. copy B. chapter C. submit D. albatross A. be tired of B. clue C. observe D. awake A. suspect B. depend on C. fishing D. fear A. hate B. frightful C. photo album D. favor A. escapist B. healthily C. space station D. risk A. stage B. unsmiling C. pumpkin D. lonely A. take up B. moth C. cut off D. tongs