1.It was essential________________(在截止日期前寄回申請表)。
2.I went to see William,__________________(結果發現他前兩天已經走了)。
3.He flatly contradicted the audience was instantaneous; no sooner ____________________(講演剛結束,聽眾就爆發了熱烈的掌聲)。
4.Should it rains,____________________(農作物就得救了)。