A. understand B. treasure C. discourage D. fallen A. Sahara B. up and down C. cube D. coke A. advice B. discover C. wage D. switch A. oneself B. sample C. spaceship D. tune A. hunger B. kingdom C. survey D. author A. whole B. rise C. was D. android A. America B. eve of the Spring Festival C. significance D. stitch A. linguist B. university C. researcher D. inspection A. copper B. wet C. afternoon D. starve A. be hard on B. mark C. binoculars D. except