单项选择题
If you ______ an agreement or law, you do something that disobeys it.
单项选择题 In this game, he was an amateur, not an expert, and thus, for the first time, became a ______ instead of a man of action.
单项选择题 Richard was his father's only ______, as he had no brothers or sisters.
单项选择题 The World Health Organization fights against ______ diseases all over the world.
