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Please disconnect the ____ to the printer.
The tour guide ___ us up the hill.
There is dew on the grass in the _______.
They were ________ the loss of their friend.
The student ______ all his chemistry exams.
History is the study of the ____.
A ________ B in the alphabet.
When the green light shows, the cars may _______.
_____ have I put my keys?