1. By the time he retires, he for twenty years. 2. By the end of the century, we a time machine. 3. By the end of the month, I in nanotechnology for three years. 4. She house by the end of the week. 5. By the time he reaches the station, his mother off the train.
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Choose the correct option.

1. By the time he retires, he
... for twenty years. 2. By the end of the century, we ... a time machine. 3. By the end of the month, I ... in nanotechnology for three years. 4. She ... house by the end of the week. 5. By the time he reaches the station, his mother ... off the train.

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