The World Health Organization gave a warning to the public without any______when the virus of H1N1 hit Mexico in April, 2009.
Mr. Wang, who _____ in this city ever since thirty years ago, _____ a report for the last two years.
— Doesn't this bus go to the park? — ________.
These are all ________houses for the homeless.
— Were you worried about him last night? — Yes. It was ________.
Now that he has missed his ________, he’ll have to wait for the next round.