The archeologist was digging., Past Simple, Past Continuous, Past Perfect, The paleontologist arrived to the piramyds., Past Simple, Past Continuous, Past Perfect, The dog had dug a bone., Past Simple, Past Continuous, Past Perfect, I caught the ball in the baseball game., Past Simple, Past Continuous, Past Perfect, I was walking around the park., Past Simple, Past Continuous, Past Perfect, We were seeing the animals in the zoo., Past Simple, Past Continuous, Past Perfect, I had finished my homeworks., Past Simple, Past Continuous, Past Perfect, We had read the evolution book for the project., Past Simple, Past Continuous, Past Perfect, The man discovered the trace., Past Simple, Past Continuous, Past Perfect, He was tripping with the skeleton., Past Simple, Past Continuous, Past Perfect, I went to school yesterday., Past Simple, Past Continuous, Past Perfect, The sun was breaking the bone., Past Simple, Past Continuous, Past Perfect, I was digging in the soil _________ I found the bone., when, while, before, after, I swam in the ocean _______ the shark was looking for food., when, while, before, after, They discoverd the skeleton __________ they had put it in the museum., when, while, before, after, The archeologist found the bone __________ they had put together the skeleton., when, while, before, after, ________ the animal was running from the dinosaur, it tripped and fell., when, while, before, after, ________ the ice had melted, the fire covered the earth., when, while, before, after, ________the meteorit fell, the dinosaurs were living on earth., when, while, before, after, _________  there were mammals on earth, the dinosaurs had existed., when, while, before, after.

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