56. D. he left
57. C. on
58. B. with
59. C. on
60. D. weightlessness
61. B. orbiting
62. C. satisfaction
63. C. spaceman
64. B. free
65. A. thrown away
READING
I. Fill in each numbered blank with one suitable word or phrase
1. A. located
2. C. largest
3. B. organization
4. C. as
5. D. fluently