单项选择题Mrs. Johnson ______ about it before me.
单项选择题Most doctors recognize that medicine is ______.
单项选择题The civil war has ______ the country s economic development by more than ten years.
单项选择题I did not know what to do but then an idea suddenly ______ my mind.
单项选择题He s mean and bad-tempered and lazy, but she loves him ______.