1) At midnight, we __________ (drive) through a heavy storm when suddenly the car __________ (break) down in the middle of the road. a) At midnight, we were driving through a heavy storm when suddenly the car broke down in the middle of the road. b) At midnight, we drove through a heavy storm when suddenly the car was breaking down in the middle of the road. 2) She __________ (not/pay) attention in class because she __________ (daydream) about her vacation plans. a) She didn't pay attention in class because she was daydreaming about her vacation plans. b) She wasn't paying attention in class because she was daydreaming about her vacation plans. 3) While the teacher __________ (explain) the homework, some students __________ (chat) quietly at the back of the classroom. a) While the teacher was explaining the homework, some students were chatting quietly at the back of the classroom. b) While the teacher was explaining the homework, some students chat quietly at the back of the classroom. 4) They __________ (argue) about something important when the phone __________ (ring). a) They were arguing about something important when the phone rang. b) They were arguing about something important when the phone was ringing. 5) I __________ (try) to solve the math problem, but my mind __________ (wander) to something else entirely. a) I was trying to solve the math problem, but my mind was wandering to something else entirely. b) I tried to solve the math problem, but my mind was wandering to something else entirely. 6) As the sun __________ (set), we __________ (walk) along the beach and enjoying the view. a) As the sun was setting, we walked along the beach and enjoying the view. b) As the sun was setting, we were walking along the beach and enjoying the view.

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