52. A. happily B. safely C. quickly D. silently
51. A. sitting B. expecting C. working D. standing
50. A. sorry B. good C. relaxing D. nervous
49. A. envy B. protect C. love D. watch
48. A. strange B. funny C. own D. new
47. A. change B. turn C. devote D. adapt
46. A. friends B. drivers C. senses D. organs
45. A. pleased B. told C. supposed D. taught
44. A. excited B. horrified C. puzzled D. moved
43. A. working B. determined C. going D. giving