The World Health Organization gave a warning to the public without any ______when the virus of H1N1 hit Mexico in April, 2009.
It made all the Chinese happy _____ China succeeded in sending up the first manned spaceship.
---May I take your order now?---_______.
She was so angry at all ______ I was doing ______ she walked out.
He old woman had a letter from her son in the army_____ to her.
It was ______ the old clock that the old man spent the whole morning at home.