71, The house (build)________ two years ago
72, Listen! The bird (sing)__________
73, Trees (plant)__________ since it (stop)___________ raining
74, Tom Baker (not come)_____________ here tomorrow
75, By the end of last March. I (study)_________ English for 5 years
76, He often (say) _________ O.K when he (talk)_________ with the guests
77, What you (do)_________ after you (go)_________ home yesterday?
78, How long you (wait)__________ for me? Just a few minutes
79, He (do)________ his homework before he went to the cinema
80, By noon, I (wait)___________ for her for hours.
71. was built
72. is singing
73. have been planted
stopped
74. will not come
75. I have been studying
76. says
talked
77. did you do
had gone
78. have you waited
79. had done
80. have been waiting
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71. was built
72. is singing
73. have been planted…stopped
74. won’t come
75. will have studied
76. says…talks
77. did you do…had gone
78. have you waited
79. had done
80. will have waited