I never doubt ______ his advice is of great ______ to me.
| A．that; valuable | B．if; value | C．whether; valuable | D．that; value |
My brother has never been late for work, __________?
| A．is he | B．isn’t he | C．has he | D．hasn’t he |
This is a cheap and simple process(过程), ____ ,there are dangers.
| A．but | B．so | C．because | D．However |
Have you returned the book to the library ____?
--- Yes, I have ____ returned it.
| A．yet, yet | B．already, already | C．already, yet | D．yet, already |
When the teacher came in , the students about the new film .
| A．are talking | B．were talking | C．talked | D．talking |
The planehere for ten minutes already.
| A．has arrived | B．has stopped | C．has come | D．has been |