I don’t think the experiment is _________ failure. At least we have gained _________experience for future success.
| A．/; the | B．a; the | C．a ; / | D．/ ; / |
He stood up,the large door and looked outside. There on the ground lay a white dog.
| A．opens | B．opened | C．opening | D．having opened |
It often happens that people with good eyesight fail to seeis right in front of them.
| A．which | B．that | C．what | D．as |
Alexander tried to get his workin the medical circles.
| A．to recognize | B．recognizing | C．recognize | D．recognized |
Why not stay at homethe road is so slippery after the heavy snow?
| A．when | B．unless | C．even if | D．now that |
Jenny was looking for a seat when, luckily, a manand left.
| A．put up | B．got up | C．dressed up | D．split up |