11.   Guatemalan investigators barely pressed the inquiry, overlooking important evidence and letting the trail to suspects go cold.

12.   He is believed to have left Rome in early July, and American authorities acknowledge that the trail has gone cold.

13.   In mountainous regions, it is unavoidable that some trails go uphill.

14.   It seems every trail to heaven goes via hell.

15.   Many genealogists simply find that their trail goes cold.

16.   NCIS and the FBI promptly reopened the Allen murder case, but within a few months the trail again went cold.

17.   Police traced the seller as far as Tallahassee, but there the trail went cold.

18.   Recent revelations showed, however, that the trail also went through cities like Atlanta and involved a few well-known Georgians, albeit in some pretty far-flung ways.

19.   The icy trail goes from Anchorage to Nome.

20.   The woman from New York was asking the instructor if there were some runs where the trail went through a narrow path of trees, eastern style.