the highway leading to the city is now( ) of fallen rock填什么?vacant ? free?

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thehighwayleadingtothecityisnow()offallenrock填什么?vacant?free?thehighwayleadingtothecityisnow()offall

the highway leading to the city is now( ) of fallen rock填什么?vacant ? free?
the highway leading to the city is now( ) of fallen rock
填什么?vacant ? free?

the highway leading to the city is now( ) of fallen rock填什么?vacant ? free?
free
Unobstructed; clear:
不受阻碍的;畅通的:
a free lane.
畅通的小路