Archaeologists in Ireland believe that a recently discovered chalice, which dates from the eighth century, was probably buried to keep from being stolen by invaders.
to keep from
to keep it from
to avoid
in order that it would avoid
in order to keep from
the planning commission voted to extend the highway 10 miles farther south, to allow commuters from the southern suburbs to travel downtown more quickly
--> this is an active construction. the modifier implies that "to allow..." was actually the intention of the planning commission; if that's not the case, this sentence is not ok.
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