In my opinion, both teachers and parents should ____ the students from playing computer games so much, which affects their studies and health.
| A．benefit | B．protect | C．discourage | D．encourage |
Edward, you play so well. But I ______ you played the piano. 
| A．didn’t know | B．hadn’t known |
C．don’t know | D．haven’t known |
She brought with her three friends, none of ______ I had ever met before. 
| A．them | B．who | C．whom | D．these |
I tried phoning her office, but I couldn’t _______. 
| A．get along | B．get on | C．get to | D．get through |
His sister left home in 1998, andsince.
| A． |
had not been heard of |
B． |
has not been heard of |
C． |
had not heard of |
D． |
has not heard of |
What do you mean, there are only ten tickets? There _____ be twelve
| A．should | B．would |
C．will | D．shall |