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. |