Look! The students _____ the classroom.A. cleaning B. are cleaning C. are clean
--- Did you know __________? --- He was ill in hospital.
--- Your classroom is very clean. --- Sure. It ________ after school every day.
They _______ here for more than ten years.
---Oh, your computer is so nice. ____ did you buy it? ---Thanks. I bought it in Wangfujing Dajie.
John had to start work at an early age, ____ his family was very poor.