Mr. Li is one of _______ best engineers in this factory. A. the B. an C. A
—______is this girl? —She is my sister. —______do you spell “sister”?—S-I-S-T-E-R.
—______your schoolbag? —It’s on the sofa.
—Are these books? —No, they aren’t. They are______.
This is new computer. It’s on table in my bedroom.
There are two windows ____ the wall and one picture __ the wall.