With all his attention ____ on the computer game, the boy even didn't notice his mother came in.
31. Nobody believed his reason for being absent from the class ______ he had to meet his uncle at the airport.
30. People ran out __________ as fire tore through the building.
28. The people had to _______ the new rulers when they lost the war.
27. People have become aware ______the fact that carbon dioxide, poison to the environment, contributes_____ air pollution.
26. Geldof intended the concert ________money for those suffering from the earthquake, which_______ 2000 lives.