He is __________ careless a student that he often __________ some letters while writing.
| A．such ；leaves on |
| B．so ； leaves on |
| C．so ； leaves out |
| D．such ； leaves out |
Annoyed by the salesman’s bad manner, John chose _____ of the two shirts on sale and left．
| A．any | B．either | C．neither | D．none |
The train is to start soon and Mary hasn’t turned up． What _____ have happened to her?
| A．can | B．might | C．may | D．should |
Had it not been for the fact that she ____ in the accident, she ____ in the race．
| A．got injured; would have competed |
| B．had got injured; would compete |
| C．would be injured; would have competed |
| D．should be injured; would compete |
I don't think a warm winter always has a negative influence on our life, _____?
| A．do I | B．does it | C．hasn't it | D．don't I |
------Did the policeman let you in?
------No, ________ I told him who I was．
| A．Unless | B．Once | C．as though | D．even if |