_____ of their bad habits, the boys switched from being dependent on their parents to _____ for others.
_____ his research paper, Professor Reagan experienced various hardships and loneliness for nearly half a year.
____ the flight to New York will be delayed is _____ I’m especially worried about.
---Have you finished your composition already, Jack? ---Yes, I ____ it within half an hour.
---Can you tell me Sam’s telephone number? ---_________.Who is Sam? The newcomer?
The three teams _____ different ways to solve the problem and they all succeeded at last.