问题补充：
用括号内所给单词的适当形式填空。（5分）
【小题1】The baby is very young. He has no (tooth) now.
【小题2】Yang Liwei is one of the (hero) in my heart.
【小题3】Smoking can bring us many kinds of (ill).
【小题4】He spends two hours (exercise) every day.
【小题5】He did his homework all by (him) yesterday. teeth
答案：
(答案→)teeth
解析：
【小题1】考查名词。句意：这个小孩很小，他没有牙齿。牙齿不止一个，常用复数。
【小题2】考查名词。句意：杨利伟是我心中的英雄之一。one of +名词复数 其中之一。hero的复数为heroes.
【小题3】考查名词。句意：吸烟能够给我们带来很多种疾病。many kinds of+名词，许多种类的illness 名词，疾病。
【小题4】考查动词。句意：他每天花两个小时锻炼。Sb spend 时间/金钱in doing sth,in可以省略。某人在做某事上花了多少时间。
【小题5】考查反身代词。句意：昨天他全凭自己做作业。by oneself 独立的，单独的。
用括号内所给单词的适当形式填空。（5分）【小题1】The baby is very young. He has no (tooth) now. 【小题2】Yang Liwei i
