Bob said he was going to join our club but he didn’t. What a shame! He ______ his mind.
| A．can’t have changed | B．mustn’t have changed |
| C．wouldn’t have changed | D．shouldn’t have changed |
According to the periodic table,still some elements undiscovered.
| A．there seem to be | B．it seems to be | C．it seems that | D．here seem |
Calculations, which are astronomically exact, have been madewith the use of computers.
| A．possible | B．it possible | C．possibly | D．to be possible |
The man deniedany thing at the supermarket when he was questioned by the police.
| A．to have stolen | B．having been stealing | C．having stolen | D．to steal |
“Do you thinkI should attend the lecture?” she asked me.
| A．that | B．whether | C．if | D．when |
Some womena good salary in a job instead of staying home, but they decided not to work for the sake of the family.
| A．could have made | B．should have made | C．would make | D．must make |