填空题The murderer ____________ (混在人群当中)with an attempt to shoot at the Prime Minister whenever he seized a chance.
填空题Scientists will have to ______________ (提出提高世界粮食供应量的新方法).
填空题they are likely to drop out of school and less likely to succeed in life
填空题explained
单项选择题A.which is grippingB.to gripC.grippedD.gripping