Unless some extra money ________(find),the theatre will close.
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The reports went missing in 2012 and nobody ________(see) them since.
—Haven't seen you for ages! Where have you been?—I went to Ningxia and________(stay) there for one year,teaching as a volunteer.
Since the time humankind started gardening,we ________(try) to make our environment more beautiful.
We won't start the work until all the preparations ________.