Question

a line intersects a plane in one point .(always, sometimes, never)
two planes intersect in a line.(always, sometimes, never)
two planes intersect in a single point.(always, sometimes, never)
planes have an edge.(always, sometimes, never)
a segment has two endpoints.(always, sometimes, never)
three points are coplanar.(always, sometimes, never)
two lines intersect.(always, sometimes, never)
angles are adjacent.(always, sometimes, never)