1.   Harriet glanced around, wondering if she could slip out unnoticed.

2.   I started edging towards the door, hoping to slip away unnoticed.

3.   If they had been invited it might have made it easier, since it would have allowed him to slip away unnoticed.

4.   There were a lot of people at the party, which made it easy for Gary to slip away unnoticed.

5.   It is one of the most popular butchers in the area and it is easy for a small child to slip out unnoticed.

6.   And the justices can rest with the knowledge that they did not let a troubling case of judicial corruption slip by unnoticed.

7.   After a rocky and sometimes violent start, American colleges were so swiftly and quietly integrated that a miracle slipped by unnoticed.

8.   Meanwhile, whole cultures slip by unnoticed, as if they barely existed.

9.   When the right music is released at the wrong time, it can slip by unnoticed.

10.   Every year thousands of North Africans attempt the treacherous crossing over the Strait of Gibraltar seeking to slip unnoticed into Europe.