—Is the girl in the red skirt your sister?—No. She is____ classmate.
The government of Yancheng is building_________cheap and good houses for the people.
—________that China has the largest number of iphone4s users now. — I believe so.
Drivers are warned___________when they are tired.
—Is this ___________ruler? —No.________________is over there.
My brother is always the first_______ to school.