1 . ________ (sharp) up your public speaking skills, so that you can share your book with relevant audiences. (用所给词的适当形式填空)
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2 . The problem with pencils is that you have to __________ (sharp) them after being used for some time. (所给词的适当形式填空)
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3 . ________ the internet, a blog seized my eyes that human footprints might ________ the ecosystem.
A.When I surfed; sharpen | B.When I was surfing; threaten |
C.While surfing; sharpen | D.I surfed; threaten |
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