—Have you seen the film before? —No. This is the first time that I________ it.
| A．see | B．saw | C．have seen | D．had seen |
It has been announced that candidates ______ remain in their seats until all the papers have been collected.
| A．can | B．will | C．may | D．shall |
—Well, I forgot to bring my dictionary here yesterday.—Actually you _____ it here. You were not allowed to use it.
| A．needn’t bring | B．needn’t have brought |
| C．didn’t need to bring | D．don’t have to bring |
—Many people in England love to give advice on weather reporting.—Yes, but I think the weather office’s computers _____ be more accurate.
| A．can | B．must | C．ought to | D．might |
The whole building _____ burned down, but the heavy rain _____.
| A．might have; would help |
B．could have been; helped |
C．must have; helped |
| D．should have been; was helping |
Messages ______ be changed from sound into electricity before they ______ be sent by radio.
| A．must; will | B．have to; can | C．can; must | D．need; may |