—Must we keep the window________ all the time? —No, you don’t have to.A. open B. opened C. Opening
— ____________ ? — J-E-N-N-Y, Jenny.
—Thank you, Thomas. —________.
— Is this a key? — ________ .
—Is this your baseball, David? —No, it's not . It's Helen's.
— ________is your notebook? —It’s green.