用括号内所给单词的适当形式填空。 1. Two American (visit) will come to our school. 2. We'll learn the ____________ (twelve) unit next week. 3. Why are you so ____________ (forget) , Mike? 4. The yellow River is the second ___________(long) river in China. 5. I'm ____________ (true) sorry to hear that. 6. There are some children ____________ (play) football on the playground. 7. The ____________ (man) names are Li Ping、Wang Lin and Yang Li . 8. This book is mine. That one is____________ (they). 9. The cat wanted to be on the side of the ____________ (win). 10. Three (five) in our class are boys.