The reports went missing in 2012 and nobody ________(see) them since.
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—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 ________.
—How much do you know about the Youth Olympic Games to be held in Nanjing?—Well,the media ________ (cover)it in a variety of forms.