根据句意和汉语提示，在空格中填入正确的单词。（每空填一词）
Beijing has already ____________(成功) in hosting the 2008 Olympic Games.
Air pollution is ____________(有害的) to people’s health.
The large population also causes many other __________(困难) for the whole nation.
I can’t go shopping in big stores_________(除非)I travel for a couple of hours.
He has ___________(大概) gone home.
____________(欧洲的) countries are beautiful .
__________(一旦) you’re tired ,you should have a rest immediatetly