-- Oh, so many people are standing outside the hall. ______ will the film start?
-- ______ seven o'clock.
如图,在△ABC中,AD是△ABC的中线,分别过点B、C作AD及其延长线的垂线BE、CF,垂足分别为点E、F.
求证:BE=CF.
补全句子:She rides a bike____Mondays.