We are sure one day the air in Beijing will be much ______ than today.
Of the stars , the sun is _____ to the earth.
I saw ___ eighty-year-old man with ____ umbrella in such a sunny day just now.
This book _______ be Tom’s. Look! His name is on the cover.
If I ______ you, I _____the job.
It’s really impolite to laugh_______ others.