_____ three influenza type A virus subtypes(子类型) have been found in pigs.
—Pardon?Who will come? —________.
One way to understand thousands of new words is to gain ________ good knowledge of basic word formation.
Every possible means ________, but it seems that nothing will prevent the situation from getting worse.
(2013•天津卷)While she was in Paris,she developed a________ for fine art.
The ________ shoes were covered with mud, so I asked them to take them off before they got into ________ car.