—Sorry indeed, I ________ to your birthday party if …—Forget it. I know you were out on business.
Google is testing a new television programming search service, _____ users to find shows videos from websites like Youtube.
It is only after my father was long gone _____ understand his deep love for me.
A growing number of people are beginning to believe that learning new skills and knowledge _____ more promotion opportunities.
His interests extended _____ the fine arts to international politics and philosophy.
—Mr. Smith _____ in Russia for 10 years. —No wonder he can speak Russian fluently and now teaches Russian in a Chinese college.