What ________ useful dictionary ________!(   )

A．a; is it

B．a; it is

C．an; it is

D．an; is it

—Who is ________? (  )
—He is Tom.

A．Her

B．his

C．he

根据首字母拼写单词，完成短文。
Jack's father would like to be a p________. He can make the city a safe place. Every day he goes around the city. After work he often sits at his personal c________ to talk to his net(网) f________. He finds it interesting to make friends with t________. He also finds some information about policemen's work. His police s________ is not far away from his housing e________. Sometimes he walks t________. He loves his job b________ he can help people in different ways.

This is my sister. _______a nurse. （   ）

A．He's

B．I

C．She's

__________ is a queen. (    )

A．He

B．She

C．It