用所给词的适当形式填空。 1. September is the ________ (nine) month of the year. 2. Jack is the ________ (twenty) student in our class. 3. I ________ (like) the lecture because it's boring. 4. Please tell ________ (I) about ________ (you). 5. Two ________ (hour) work make the old man tired. 6. She has ________ (lot) of pen pals from different ________ (country). 7. How much are the ________ (piano)? 8. The ________ (run) look very young.