1But the tram rumbling by keeps one on one's guard.
2Still, it is always best to be on one's guard.
3One had need be on one's guard as to what one says before her.
4It's a question of being informed and on one's guard.
5Still, Sophia, I felt one should be on one's guard where foreigners are concerned.
6It's an amiable weakness, but one has to be on one's guard against it.
7One must be on one's guard against first impressions, Mary.
8One had always to be on one's guard, could never say everything to the same person.
9And will one be perpetually on one's guard?
10Had Grant been a Congressman one would have been on one's guard, for one knew the type.
11He thought the elder girl had some intelligence; one would have to be on one's guard with her.
12He is so gentle and refined, and one need not be on one's guard in talking to him.
13It would be well to be on one's guard, especially as he received all pleasantries with unruffled calmness.
14The sons of Bowanee are no worse than Mr. Sheldon, and one might be on one's guard against them.
15It is imperative to be on one's guard against any similar experience again,-thatbeing the only benefit that can come from disasters.
16And in view of this fact one must be on one's guard against confusing a logical transformation of concepts with a genealogical development.