TV highlights: The first season of ABC Family's 'Becoming Us' comes to a close.

(All times Eastern)"Cake Wars" (Food Network at 8 p.m.) celebrates the 50th anniversary of "The Sound of Music" with a themed challenge. On "The Fosters" (ABC Family at 8), secrets are revealed when the family attends Brandon's music competition. Meanwhile, Callie grows suspicious of Brooke and Carmen, and Mike learns something that could support Stef's theory about the hit-and-run.