72 According to the time table, the train for London ___ at seven o'clock in the evening.
A. was leaving
B. has left
C. leaves
D. will leave
73 You should visit this part of the country when ___
A. spring will com
B. spring comes
C. It has been spring
D. It will be spring
74 You needn't hurry her. She ___ it by the time you are ready.
A. will have been finishing
B. Would finish
C. Will have finished
D. Will be finishing
75. We can go home when the ground ___
A. is drying
B. has dried
C. dried
D. will dry
76. Obviously, he ___ a bad cold. He sneezes so often.
A. has
B. has been
C. had
D. was
77. Darwin proved that natural selection ___the chief factor in the development of species.
A. has been
B. had been
C. is
D. was
78. While Peggy ___, her brother is playing records.