______ their return, they were praised as national heroes.

Mary is crazy _______ playing the piano. 

Large earthquakes __________ the ocean can create a series of huge, destructive waves called tsunamis that flood coasts for many miles.

Henry, ＿＿＿＿＿ Mary and Tom, is coming to China for a visit? Which is WRONG? 

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