按要求填空。 1. I am (缩略形式) _____________ 3. It's (完整形式) _____________ 5. book (复数形式) _____________ 7. where is (缩略形式) _____________ 9. boy (对应词) _____________ 2. What's (完整形式) _____________ 4. Thanks (同义词) _____________ 6. chairs (单数形式) _____________ 8. cold (反义词) _____________ 10. happy (反义词) _____________