用所给字母组成单词。 1. p b a a c c k k ________________ 3. e i r s t h ________________ 5. u t e f l ________________ 7. k e e g a o l e r p ________________ 9. a a l c e p ________________ 11. k e r a b ________________ 2. r i p t ________________ 4. p r o a m g r ________________ 6. i i o n l v ________________ 8. t o n b d a n i m ________________ 10. e r u b t t ________________ 12. o u f l r ________________