---- Is that pen? ----- No, It is eraser.A. a; a B. a; an C. /;an
—Remember to close the door when you leave.
—Why not join us in the game,Kitty? —_________, but I have to do my homework first.
—Could you tell me_________? —By underground.
Jin Yong is one of the greatest and oldest _________ writers. He is still_________.
—Who your English teacher? —Mary .