(1) After a hour or so we began to feel very frightened. (a 改为 an,因 hour 读音以元音开头) (全国卷)
(2) I decided to climb the tree to see where we were. (the 改为 a,因此处并非特指,而是泛指) (全国卷)
(2) Some people read the books or watch television while others have sports. (去掉 the,因这里的 books 表泛指,不表特指) (全国卷)