—What ______ can I do for you? —Thank you, but I can finish it myself.
Please don't stand up in class until you ________.
You don't know __________________________.
---She’s never been to Shanghai, ____________? . --- ___________. But how she wishes to go there again.
John doesn’t play the piano _________________ his classmates in his class.
When I came here just now, I saw he _______with a black and white dog in the garden.