--Jack's never worked hard at English, _______?-- _______ , so he can't answer the question in English, I think.
—___________ is the sofa? —It’s $300.
—_________. Is this your pen? —Yes, it is.
—Do you like history? —Yes. I think it’s _________.
-_______ is your mother?-She is fine!
Cindy plays volleyball every day, but she ______ play tennis.