—I'm sorry to hear that Bill failed the exam again.

—Don't worry about him. I'm sure that he will never give up until he ________.[ ]

A. succeed

B. succeeds

C. succeeded

D. succeeding

肺炎链球菌肺炎的特征是（）

A.咳出大量脓臭痰，X线显示脓腔及气液平

B.全身中毒症状，X线胸片病变多在肺尖或锁骨上下，痰中可找到结核分枝杆菌，一般药物治疗无效

C.有静脉血栓的危险因素，呼吸困难明显，颈静脉充盈，动脉血气分析常见低氧血症和低碳酸血症

D.无急性感染中毒症状，痰中带血，血白细胞计数不高

E.起病急，以高热、寒战、咳嗽、血痰及胸痛为特征