—What __________ your father __________?—He’s generous and polite.
He is __________ unusual inventor and he invented _________ useful invention.A. a; an B. a; a C. an; an D, an; a
I didn’t know __________. Can you tell me?
It’s very kind _________ you to help me carry the boxes since it is difficult _________ a person like you to carry so heavy things.
____ of the students has finished the exam, so ___ has come out of the classroom.
We think white looks good ________ you, but people with black skins don’t lookgood ________ white.