有人在门口。我应该让他们进来吗？

___They 're at the door. Should I let them in?

我有个朋友要过来，但他们有点迟到了。

I have a friend coming over, but ___they are running a bit late.

“有你的电话。”“他们想干嘛？”

"There's a call for you." "What do ___they want?"