根据对话内容，从方框中选择恰当的选项补全对话，其中有两项多余。

A：Hello，Bob．

B：Look!I live in the tall building next to the library．

A：

B：It's three kilometers．

A：

B：I usually take the bus but sometimes I go to school on foot．

A：

B：Oh,let me see．About fifteen minutes．

A：

B：Mmm…at about 7：45．

A：OK．Thank you．Bob．It's nice to talk to you．

A．What's the time? B．Where do you live? C．Why do you walk to school? D．How do you usually go to school? E．What time do you usually Ket to school? F．How far is it from your home to school? G．How long does it take to get to school by bus?