3．____________________Native Americans came across from Asia，somewhere between 12,000 and 25,000 years ago.
人们通常认为印第安人是在12,000至25,000年间来自亚洲的某个地方。
答案：It is generally agreed that
4．________________________ the most beautiful rainbow.
山上边有最美丽的彩虹。
答案：Over the hills beyond was
