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.