2 . No one really knows exactly when the first people arrived in                 now. (call)
没有人知道确切在什么时候第一批移民者到达我们今天称之为美国的地方。

3 . 他迷路了，不知道该做什么？
He was lost and doesn’t know ________________ (what)

4 . 我已经答应他只要他遵守协议他会得到他想要的。
I have already promised him that he _______________________ as long as he keeps his side of the bargain. ( what )

5 . 我想知道他是什么时候告诉你真相的。
I wonder                          he told you about the truth. ( it )

6 . When the survivor came to himself, he was eager to know _________________that saved him from the burning house. (be)
当生还者醒过来后，他急切的想知道到底是谁把他从燃烧的房子里救出来的。