34. The international agreement, ________ to encourage children not to smoke and help people kick the habit, was signed on February 27.
Only _____ as an interpreter _____ how important it was to practise speaking English.
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.