He is __________ unusual inventor and he invented _________ useful invention.A. a; an B. a; a C. an; an D, an; a
—Is Mr. Smith really ill ? —________.He’s in hospital.
—I don’t know if my uncle ______me a new dictionary .— Well , if he _____you one ,I’ll buy one for you .
----Can you tell me _______he will be back ---In a week ?
The house used to ______.
—____ —They’re books.