I don't know whether my sister will come or not, but if she __________ , __________.
With the popularity of ______ cell phone, more and more people are addicted to it and do less and less face-to-face communication, which has become _______ widespread concern.
-----Are you sure you won’t come for a drink with us? -----______, if you insist(坚持).
Nancy invited Tom and Ann to dinner, but _____ of them came.
I ordered ______book some days ago. ______ book has arrived.
This is not a match. We are playing chess just for _______.