I’d rather have a room of my own, however small it is, than _______ a room with someone else.

A．to share

B．to have shared

C．share

D．sharing

AD是△ABC的边BC上的中线，AB＝12，AC＝8，则边BC的取值范围是＿＿＿＿___________________；中线AD的取值范围是＿＿＿＿______________．