Do you have a pen?I want _____ a letter.
Mo Yan is one of _____ writers in the world.
--- Is there_____ beef in the fridge?--- No, there isn’t. There is ______ pork.
If you work harder, you’ll have another______ to play the violin at a concert.
--- Mary, who’s______ woman over there?--- She’s my aunt, ______ English teacher.
Do you know the man_______ saved five people in the fire?