model A:where there is a river ,ther is a city .
model A:where there is a river ,ther is a city .
1有志者,事竟成.where there is a will,_______
2有垃圾的地方,就有苍蝇.————,there is a fly
model B:restoring the city andits cultural relics seemed impossible
1下象棋看来是很有趣的事.playing chess________
2了解西方文化中的餐饮礼仪是很有必要的.——————is necessaey