选择句子补全对话。（共10分）

Sarah:                        .
Sarah:                  .
Peter:Thanks.Do you have a computer room?
Sarah:                  .It’s on the first floor.
Peter:Oh,so many computers.                   .
Sarah:Yes,it is. We have many books.
Peter:                         ?
Sarah:Oh,It’s 4 o’clock.It’s time to go home.
Peter:                            .
Sarah:Yes,it is.I have an umbrella.Go with me.
Peter:Thanks.