We rushed to the football court, only to see a sign _____ into the ground reading PERIODIC MAINTENANCE (定期维修).
A． knocked B． knocking C． to be knocked D． being knocked
．— I don’t think we have met before.
— Yes, once at a party, but we _______.
A．didn’t introduce B．weren’t introduced
C．haven’t introduced D．weren’t introducing
_____ the Hope Project was carried out in this poor area, students here had no access to education.
A．Once B．As C．Before D．After
Tom, turn down the music. Why you make such a big noise while your baby sister is sleeping?
A．must B．would C．should D．may
．It rained for two weeks, completely _______ our holiday.
A．ruined B．ruin C．to ruin D．ruining
It is known to us all E-mail is______ efficient than sending a fax.
A．much B．many C．more much D．much more
