When the old man _______to walk back to his house,the sun________itself behind the mountain.
Last Friday, Mr. Smith gave us an _______ speech and we were all ______.
—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.