With the popularity of ______ cell phone, more and more people are addicted to it and do less and less face-to-face communication, which has become _______ widespread concern.
________ he stops driving himself like this, he'll have a breakdown.
________ my teacher didn't tell me directly, I still felt that I didn't live up to her expectation.
I was wondering what to do with my car which won't start ________ a kind man offered to help.
________ much advice you give him, he does exactly what he wants.
________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.