So many uses have been discovered for this wood __________ the supply of white pine is becoming smaller and smaller.
—Are you worried about the coming exam? —Only ______.
Word came ______ our school will build a new teaching building next year.
A poet and artist _____ coming to speak to us about Chinese literature and painting tomorrow afternoon.
We must try our best to the river being polluted any more.
_____ he can pass the driving test is quite uncertain.