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He is an ________ boy.

[　　]

A．eight years old

B．eight-year-old

C．eight-years-old

D．eight-years old

He is an ________ boy.

[　　]

A．eight years old

B．eight-year-old

C．eight-years-old

D．eight-years old

She is an ___girl

In the traffic accident, an _______ girl was badly hurt this morning.

A．eight-years-old                         B．eight year old

C．eight-year-old                          D．eight-years old

I have a clever sister, she is an __________ girl.

A．eight years old                                   B．eight year old

C．eight-years-old                                  D．eight-year-old