—He’s never heard to sing a pop song so loudly, ______ he?—______. He is so shy.
My brother has never been late for work, __________?
This is a cheap and simple process(过程), ____ ,there are dangers.
Have you returned the book to the library ____? --- Yes, I have ____ returned it.
When the teacher came in , the students about the new film .
The planehere for ten minutes already.