49. A. experiments B. circles C. trips D. movements
48. A. great B. strange C. public D. tiny
47. A. height B. pleasure C. wonder D. danger
46. A. streets B. crowds C. passengers D. city
45. A. distance B. height C. space D. rope
44. A. Through B. Against C. With D. On
43. A. sure B. uncertain C. glad D. nervous
42. A. act B. landing C. step D. trip
41. A. throw B. walk C. climb D. fix
40. A. roof B. position C. wall D. building