The World Health Organization gave a warning to the public without any ____when the virus of H1N1 hit Mexico in April, 2009.
______ more attention, the tree could have grown better.
You _____ leave all your clothes on the floor like this!
We have to work hard, ______ we’ll lose the chance.
---Keep me informed _______ the latest news. ---Ok.
---Are you still going work on foot? ---Yes. My car _______ in the garage.