Americans eat ______ vegetables per person today as they did in 1910.
| A．more than twice | B．as twice as many |
| C．twice as many as | D．more than twice as many |
I think it ______ that one have a good command of English if one wants to be engaged in international trade.
| A．useful | B．a must | C．essential | D．vital |
It was on May 12, 2008 ______ the Wenchuan Earthquake happened.
| A．when | B．which | C．since | D．that |
Mother told me ______ near the river.
| A．don’t play | B．not to play | C．not play | D．not playing |
His friends ignored his advice, ______ they knew it to be helpful.
| A．as if | B．since | C．even if | D．so that |
I ______ along the road when I saw Peter. So we stopped and had a chat.
| A．walked | B．was walking | C．would walk | D．had walked |