The problems, _____ properly, will seriously affect the relations of nations.
| A．not solved | B．if not s olving |
C．if not solved | D．if not to solve |
I can't make a decision now. I need _________ more time to think it over.
| A．rather | B．fairly | C．quite | D．lot |
Moreover, __________you may hardly believe, the examiners had decided in advance to fail half the students taking part in the exams.
| A．which | B．that | C．who | D．whom |
He is believed____________ in at his office on his way home.
| A．dropping | B．to have dropped |
| C．having dropped | D．to be dropped |
The boss____________ the worker how to do it, or the accident couldn't have happened.
| A．can't have told | B．ought to tell |
| C．could have told | D．mustn't have told |
She liked the dictionary so much that she would like to take it ____________ it cost.
| A．why | B．how much | C．whatever | D．how expensive |