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Road Building　　People of early civilizations built roads of a sort.However, the first good road (31)_____ were the Romans.They built the earliest network of hard-surfaced roads.The Romans (32)_____ their road building about 300 B.C.and continued for about five hundred years.
Roman roads were good because the people (33)_____ how to lay a solid, thick base.On top of this, they put a pavement (路面) of flat (34)_____.Their roads were a bit (35)_____ in the center than on the sides.Along the sides ran ditches (沟渠) so that the (36)_____ could run off.These roads were also very (37)_____.They went over most of the hills instead of around them.
The Roman roads were used (38)_____ by soldiers.At first, these roads went through Italy.Then, as the Roman Empire spread, roads were built in other (39)_____ of Europe.In all they laid about 50,000 (40)_____ of roads.
A.builders
B.miles
C.stones
D.higher
E.correctly
F.sdivaight
G.mainly
H.coundivies
I.clearer
J.began
K.water
L.knew