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Wehaveunderstoodwhere、Theyhaveallreadwhere和Sarahhasheardwhere填这些从句,
Wehaveunderstoodwhere、Theyhaveallreadwhere和Sarahhasheardwhere
填这些从句,


Wehaveunderstoodwhere、Theyhaveallreadwhere和Sarahhasheardwhere填这些从句,
Wehaveunderstoodwhere、Theyhaveallreadwhere和Sarahhasheardwhere
填这些从句,
Wehaveunderstoodwhereweshouldputthesebookson.
Theyhaveallreadwheretheywillgoforapicnic.
Sarahhasheardwhereshecanbuythepencil.