What's the ______ of your stay?

But it's your efforts ....... that have made your stay so fruitful.

A、who
B、what
C、which
D、that

It’s your efforts that have made your stay so ________(富有成效的)

A、successful
B、fruitful
C、effective

And what _______ you? What’s your name?

Tell you what, let’s stay here ______ day.

A、others
B、other
C、some others
D、another