你当初为什么邀请她？

Why did you invite her ___in ___the ___first ___place?

起初，你们对我来说是陌生人，但现在你们是我特别的外国朋友。

___In ___the ___first ___place, you were unknown people for me, but now you are my special foreign friends.

我们当初就应该讨论这个计划。

We should have discussed the plan ___in ___the ___first ___place.