The wire was found broken. And ______, there happened to be no one getting near.

(2009年合肥市高三第一次教学质量检测)The police tried to get some clues from the suspect，but he remained     ．

Henry was away from home for quite a bit and _______ saw his family.

Mr. Lin’s comments were very difficult to follow because they were ______related to the topic under discussion.

_____ three influenza type A virus subtypes(子类型) have been found in pigs.