At present , the butter factory is still polluting the river though it _____to stop.
| A．ordered | B．has ordered | C．will be ordered | D．has been ordered |
He suggested the person referred _______ put into prison.
| A．is | B．be | C．to be | D．should be |
“Where is it?” “Where is _____? I don't know what do you mean?”
| A．what | B． that | C．where | D．so |
Our math teacher, however, _____ speak English well.
| A．doing | B．does | C．is doing | D．was doing |
Your mother, however, ____ say that to us that day.
| A．does | B．did | C．is doing | D．was doing |
An awful accident, however, _____occur the other day.
| A．does | B．did | C．has to | D．had to |