6、如图所示,∠1和∠2是两条直线____________与____________被第三条直线____________所截的____________角;∠5和∠6是两条直线____________与____________被第三条直线____________所截的____________角;∠2和∠6是两条直线____________与____________被第三条直线____________所截的____________角.

7、如图所示,∠ABD的同位角有____________,内错角有____________,同旁内角有____________;∠BGH的同位角有____________,内错角有____________,同旁内角有____________.

8、如图所示,直线AB,CD被BD所截构成∠3和__________是内错角,AD,BC被BD所截构成的∠1和∠2是___________角,AD,BC被AB所截构成的∠5和∠ABC是___________角,∠6和∠ABC是____________角.
