利用如图装置探究平面镜成像特点
He ____ (not go) to bed at 8:30.
She ____ (do) her homework at 7:00 in the evening.
Scott ____ (work) very long hours.
What time ____ you usually ____ (get) up?
I’m the last one ____ (take) a shower.
My father ____ (watch) TV in the evening.
已知∠AOB=30°，自∠AOB的顶点O引射线OC，若∠AOC: ∠AOB=4:3,则∠BOC=（ ）
