We should not________and laugh at those who have no homes to shelter from the rain and wind.Instead,we should be sympathetic of them.
Nearly four hundred supermarkets in Beijing are preparing to dim(使暗淡) their lights ________ the "Earth Hour 2010" on Saturday night.
A salty diet may increase the risk of stomach cancer ________ 10 percent, South Korean researchers found in a study of more than 2 million people.
The first textbooks ______ for teaching English as a foreign language came out in the 16th century.
Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors.
— Would you mind my coming over and having a look at your new garden? My little son’s curious about those roses you grow. —________.You are welcome.