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After Jim and Ben the tickets, they entered the theme park.
Most people ... home by the time we arrived at the zoo.
When we went back to the car, Dad discovered he ... his wallet.
We chess when Carl's mother phoned.
The students when the teacher was explaining the exercise.
Most people __had already gone__ home by the time we arrived at the zoo.
When we went back to the car, Dad discovered he __had lost__ his wallet.
We __were playing__ chess when Carl's mother phoned.
The students __were listening__ when the teacher was explaining the exercise.