who was the_______ of america,do you know?(discover)

who was the_______ of america,do you know?(discover) Do you know when Columbus __(discover)America Who d____ America,do you know do you know who ___the America? The discover of America was an accident有错吗 Do you know the_______?Yes,it is purple 英语Do you know all the_______(writer)names? Who后面的动词如何判断用不用第三人称单数形式?如 Do you know who (discover)the pen? Do you know who discovered America and who invented the comp Do you know who was the last_____the classroom last night? do you know who was the first_________ here Do you know who ( )Australia?Yes.It was Cook