Can you ______who has lost the watch?
---How many_________ are there in your school? ---Twenty.
My grandmother eats _______ food, so she is in good ________.
——________do you go to the dentist?——Let me see, twice a year, maybe.
I’m not good at playing ________ piano, but I can play ________ volleyball very well.
---May I have ________ new books?---Sorry, there aren’t ________.