.
. ----She looks so unhappy. Did you tell her the truth yesterday?
----Yes, but I ____ her later.
| A．must have told | B．should have told |
| C．shouldn’t have told | D．mustn’t have told |
— What made her so sad？
— _____ she failed in the examination.
| A．That | B．Because | C．As | D．Since |
Honestly speaking, it is my teacher’s _____ that made me finally take up my present career
as 
a biology researcher.
| A．advantage | B．influence | C．taste | D．guard |
-- Can you persuade him out of the foolish idea?
—_______ no point in doing so—he’ll never change his mind.
| A．It is | B．It has | C．There is | D．There has |
____ the old mother’s deeds, all of us couldn’t keep back our tears and began to cry.
| A．Moved by | B．Moving with | C．To be moved by | D．To be moving by |
Knowledge is to one’s mind ______ food is to one’s body.
| A．that | B．where | C．what | D．which |