-Do you know _____ man in black?-Which one? _____ one outside the classroom? He’s ____ new teacher.
She wants three ________ and some ________.
The earth(地球) is our home, and we must _____ it clean.
–What would you like to drink? --______, please.
The children are playing a game _______ "hide and seek".
Today is Halloween. I ____ as a ghost, and of course I _____ a special costume.