___ many times, she still didn't know how to do it.
Only when _____ possible to settle the problem.
The boy said ___ couldn't he work out the problem but his teacher didn't know how to do it.
The headmaster hurried to the concert hall only _________ the speaker
.Only in this way ______ get rid of the bad habit-smoking.
___ ____ I passed the interview! ___ Good luck to you. next time!