2 . 杰克一到家，就惊讶地发现他家的门敞开着。(be＋adj.＋to do)
On arriving home, Jack ________________．

4 . 我们一看到这所房子就想买下它。(moment)
__________, we wanted to buy it.

5 . With housing price going up fast, ordinary people ________________.(find＋it＋adj.＋to do)
随着房价的快速上涨，普通人很难买得起房子。

6 . Many houses on the island had been washed away by the high tides, which made many islanders homeless.(改为主动语态)

7 . 这座举世闻名的艺术博物馆设于一座古老的铁路建筑里，重点展出十九世纪印象派运动中最著名的一些画作。
___________, this world-famous art museum features some of the best-known paintings from the Impressionist movement of the 19th century.

9 . 人群中恰巧有人知道一家收留孤独老人的组织。（happen，house）
Someone in the crowd__________ __________ __________an organization__________ __________lonely old people.