用所给词的正确形式填空。 1. The boys like to listen to music when they do ____ (they) homework. 2. My mother's work is ____ (make) our city safe. 3. One day, Mr Green asked Mrs Green _ (go) shopping with him. 4. We would brush our ____ (tooth) twice a day. 5. This book is the lightest and (thin)  of all the books. 6. She is ____ (good) than Alice at swimming. 7. Janet ____ (get)  up at 7:30 am every day, so she is always late for school. 8. I think the ____ (four) lesson is the most difficult in this book. 9. Look at the sign. The library is ____ (close) from 1:00 pm to 2:00 pm. 10. Jason is used to (watch) TV the whole night.