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