A.streets
B.troops
C.buses
D.trains
A.In
B.By
C.During
D.Within
A.in exchange for
B.with regard to
C.by means of
D.in the form. of
A.visited
B.buried
C.lived
D.made
A.that
B.which
C.whose
D.such
A.necessary
B.easy
C.important
D.hard