Now let us observe what
Now, mark it.
Now, on the other hand, let me
Now perhaps you will ask me
Now we come to the question

Observe, if you please, that
Occasionally it is whispered that
Of course, it will be said that
Of no less import is
Of the final issue I have no doubt.
On the contrary
On the one hand
On the other hand
On the other hand, you will see
On the whole, then, I observe
One word more and I have done.
Once more, how else could
One fact is clear
Only a few days ago
Our position is that
Our position is unquestionable.
Over and over again it has been shown that

Perhaps, sir, I am mistaken in
Perhaps the reason of this may be
Permit me to add another circumstance
Permit me to remind you
Please remember that if