--You have dropped ____ “s” in the word “necessary”.-- Oh, yes, ____ letter “s” should be doubled.A. a, an B. an, an C. an, the
I enjoy playing computer games, but I can't spend too much time ________ that.
________ is bad for your eyes ________ TV too much.
She is ________ poor ________ buy that nice dress.
—How often do I need to feed the dog? —It ________ food every day, or it will be hungry.
—It's difficult to get to the other side of the river. —I think a bridge ________ over the river.