题目内容：

英语,用正确形式填空
More than 25,000years ago,the first men__(arrive)on the continent of America.These red-skinned men__(be)Asians,who came from the far North in search of food.After 150 centuries__(pass),there were red-skinned men__(live)in all parts of North and South America.Some tribes__(build)cities and great civilizations.Their living on this continent__(become)a milestone in human history .
In 1492,Christopher Columbus,who__(look)for a new sea route to India,"Indians"to the red-skinned people he__(see)there.Europe had finally discovered America.

优质解答

1.arrived 2.were 3.had passed/passed 4.living 5.had built 6.became
7.were looking for 8.saw