1 . As the man came near, ________.（根据句意填空）

2 . ________ (由于要建一座房子), we must save every cent.   (根据汉语提示完成句子)

3 . _________ _________ _________ _________ (直到) all the fish in the river died out that the villagers realized the importance of protecting environment.（根据汉语提示完成句子）