This is Lily is sister.H( )ruler is blue.

This is Lily is sister.H( )ruler is blue. this is david()ruler is blue This is a blue jacket.And that ruler is b This is Alice._____ ruler is blue.应该填什么? This is a ruler._____ ruler is blue中____应填写The,还是A? This is .ruler..ruler is bule. ( ) ruler is this? Is this red ruler ( this ruler is-----? is this your ruler this is his ruler This is "a ruler".