听力原文： A Pakistani lawyer said the resumption of the trial of 8 foreign aid workers accused of preaching Christianity in Afghanistan has been put off until Sunday. He had met earlier Saturday with the aid workers, 2 Americans, 2 Australians, and 4 Germans. They insisted they were in Afghanistan to help the poor, not to convert them. The penalty for those captured aid workers could range from expulsion to a jail term or death sentence. Eight foreign aid workers were arrested in Afghanistan because of their ______ activities.