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　　1.We can say a lot of things about those who are devoted to poems in their whole lives . They are passionate, impulsive and unique.

　　2.Mary couldnt have received my letter, or she should have made a reply last week. .

　　3.Nancy is supposed to have finished her chemistry experiment at least two weeks ago.

　　4.Never once has the old couple quarreled with each other since they were married 40 years ago.

　　5.The prosperity of a nation depends largely on the quality of education.