高中英语的语法填空,
Christmas is ___________ special holiday when__________ whole family ____________ (be)         supposed to get together.最后一个空为什么填are而不是were啊
.It's not _________ good idea to drive for hours whitout ___________ break.18.My neighbour asked me to go for ________ walk,but I don't think I've got ________ energy.同样是最后一个空,为什么填the,是怎么看出要填the的,从语法上解释啊,