The extra room _______ very useful when we had visitors.
| A．was proved | B．proved | C．has been proved | D．has proved |
---- What about the two MP3s?
---- Sorry, but I don’t like _____ of them. Would you please show me a third one?
| A．none | B．either | C．both | D．all |
It is hoped that these new discoveries will throw ____ light upon such ____ mysterious natural phenomena.
| A．a; a | B．a; / | C．/; a | D．/; / |
My bicycle is nowhere to be found. Who ___ have been using it?
| A．should | B．must | C．could | D．might |
He cut off the electricity immediately he found the dangerous situation, thus ____ a fire accident.
| A．prevented | B．to prevent | C．would prevent | D．preventing |
But at other moments you will find him gentle and weak, _____ he cries about the lost lives of people drowned in ships that have sunk.
| A．as with | B．as for | C．as to | D．as when |