找出下列“不合群”的单词
1. A. pupil B. son C. family D. student
2.A. book B. water C. chair D. map
3. A. home B. Africa C. school D. hospital
4. A. air B. rice C. friendship D. bread
写出下列单词的复数形式：
month 2. horse 3. class 4. fox
story 6. knife 7. zero 8. zoo
9. sheep 10. tooth 11. son-in-law 12. man-teacher
