根据提示写出正确的单词。 1. nine (序数词) ____________ 4. snowy (名词) ____________ 7. their (主格) ____________ 2. get (现在分词) ____________ 5. teacher (动词) ____________ 8. winter (相对词) ____________ 3. ski (现在分词) ____________ 6. fall (现在分词) ____________ 9. says (动词原形) ____________