Two years ago, three scientists traveled to the Antarctica to explore a secret world hidden _________ the ice.
. Be careful about the news on red fire ants—____measures to prevent the possible spread of them.
. It’s reported that in some families there have been more than one person____the Nobel Prize.
. French President Jacques Chirac met with Chinese President Hu Jintao for talks____deepening their economic ties.
. Beijing expects China’s rich civilizations to ________ the world with a happy surprise at the opening ceremony of the 2010 Shanghai EXPO.
. . ---All the building materials have been washed away. ---So I have heard. But there was no sign ______ a heavy rain was on the way last night.