im ______ the way, we had littletrouble finding the school.

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（ ）别的故都，把历史浓缩到宫殿，而南京，把历史溶解于自然。___________，___________。___________，___________，___________，大大方方地畅开一派山水，让人去读解中国历史的大课题。①南京既不铺张也不拥挤 ②也不存在可以舍弃历史的游玩③在南京，不存在纯粹学术性的参观 ④杭州是过于拥挤的沉淀⑤北京是过于铺张的聚集

Our maths teacher set so difficult an examination problem ______ none of us worked out.

I used to _______ in the countryside, but now I am used to _______ the city.

Could you tell me_______. —Sure. Walk along this road ,you can find it on your left. There you’ll see many old things.