--Hi, Mary!
-- Oh, it's you. Jack! I ______ you. You look like a star with the glasses.
| A．didn't recognize | B．don't recognize |
| C．haven't recognized | D．hadn't recognized |
With everyone’s face_________behind the mask, it’s hard to tell who they really are.
| A．having hidden | B．being hidden | C．hidden | D．hiding |
．Why must I apologize to him? I am in no way_________for the quarrel, after all.
| A．blamed | B．to blame | C．to be blamed | D．being blamed |
However busy we are, we need to take exercise. Not only___________us keep healthy, it also stops us getting fat.
| A．it helps | B．helps it | C．it does help | D．does it help |
．I’m thinking the job interview tomorrow and I would appreciate_________very much if you could give me some advice.
| A．you | B．that | C．it | D．this |
．—What do you think made hi m so excited?
—_________a scholarship to Harvard, I suppose.
| A．He has won | B．Winning |
| C．Because of winning | D．Because he has won |