用be动词的适当形式填空。 1. Lily __________short then. Now she __________tall. 2. —__________your teacher fat? —No, he isn't. He __________fat then. 3. —__________they at home then? —Yes, they__________. 4. —__________the dog thin now? —Yes, it__________. 5. I __________four then. Now I __________nine.