39. A. barbecues B. prepares C. bicycles D. cases
40. A. classmates B. fridges C. shares D. moves
41. A. studies B. roommates C. lakes D. smokes
42. A. cartoons B. textbooks C. rules D. throws
43. A. facts B. signs C. builds D. stands
44. A. passes B. stages C. varieties D. matches
45. A. activities B. wishes C. races D. spaces
46. A. types B. counties C. puzzles D. dishes
47. A. improves B. differences C. becomes D. vocabularies
48. A. sorts B. arts C. videos D. ships
49. A. sausages B. sauces C. serves D. slices
50. A. camps B. markets C. blankets D. means