My mother was doing the cleaning in the sitting room ________ the telephone rang.
The students are very busy. Some are cleaning the room. are watering the flowers.
This book must belong to because it has my name on its front page.
----What do you think of the pop music? ------to the pop music is good way to relax.
The number of students in our school five hundred.
----- Why is Mr . Yang still in the teachers’office ? ---- Maybe he _______ his work yet .