KINGSPORT — Courtney Whitson and Lainey Hill were glad to share this day together. The Dobyns-Bennett senior standouts and longtime best friends made their college choices official with a signing ceremony at the school on Wednesday. Whitson, the school’s all-time leading basketball scorer and rebounder, is heading to Middle Tennessee State. Hill, who has gone undefeated in conference play in four years on the tennis court, is going to Centre (Ky.) College. This marks the fourth straight year Hill will play in the state tournament.