A:1个
B:2个
C:3个
D:5个
①我今天起晚了,明天一定要____点。
②他刚从教室出来,我就____去了。
③瓶子里的水刚才还是满的,怎么一会儿就____了。
— It's late now. We must go back to the ________.— Yes. I really need a good sleep.