To the untutored eye the tightly forested Ardennes hills around Sedan look quite (i)____________, (ii)____________ place through which to advance a modern army; even with today's more numerous and better roads and bridges, the woods and the river Meuse form a significant (iii)____________. A. impenetrable B. a makeshift C. resource D. inconsiderable E. an unpropitious F. impediment G. uncultivated H. an unremarkable I. passage