---That black T-shirt with Yao Ming’s picture on it ____ belong to David. He likes him very much.---No, it ____ be his. He hates black colour.
----your son a computer? ------No.He one this summer vacation.
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.