Hardly __________ the Shanghai Expo _________ we realized we forgot our ID cards in the room.
By the middle of August, a national campaign was underway ________ drunken drivers.
. -- Jack _______ for work in the downtown. What was the matter? -- _______, but he had no luck.
What __ public is concerned about is whether the scientists win be able to find _____ cram for the disease.
President Obama is letting Congress write the details of his plan for ________ he calls health insurance reform.
Now everyone is concerned about how to conquer the economic crisis _______ is very important for us to be able to preserve our standard of living.