The professor’s research finally proved to be ______, though he had spent a lot of money on it.
It’s surprising that your brother Russian so quickly--- he hasn’t live there very long.
Kids don’t learn their native language , but they become fluent in them within a few years.
such heavy pollution already, it may now be too late to clean up the river.
——Are you with your present job?——Not at all. I have long desired I in your company.
The news quickly around the town.