---Whose book is it?---look! Jane’s name is on the cover(封面). It _________ hers.
There is ____ office on _____first floor.
A: Is the pen on the desk? B: ____.
A: Is there a computer in your class? B: ____.
A: ____ boys and girls are there in your class? B: There’re21 boys and20 girls.
—___________? —He is Andy’s father.