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factory post office bookstore hospital
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Because he had never been there before. Because he wanted to show that he could arrive before both the chicken and the egg. Because he had sent the chicken and the egg to himself. Because he wanted to check which of the two items would arrive first.
has been to has gone to went to goes to
where the post office is the post office is where is the post office where where is the post office
where the post office is where was the post office where is the post office where the post office was
the post office is the post office was is the post office was the post office
is waiting；went waits；went is waiting；has gone waits；has gone
the post office is was the post office is the post office the post office was
has been has gone went goes
where is the post office where can I find the post office where the post office is how can I find the post office
is waiting; went waits; went is waiting; has gone waits; has gone
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