( )1.A lot of water___ every day.It is a serious problem.

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( )1.A lot of water___ every day.It is a serious problem.
A.wastes B.is wasting C.was wasted D.is wasted
（）2.When and where____the last APEC conferences___?
A.were.held B.are.held C.will.hold D.did.hold

1.D（首先,water是不可数名词,用三单形式,其次,浪费（waste）的动作时别人发出来的,对水来说,是被浪费,所以要用被动语态,一般现在时的被动语态结构为am,is,are+过去分词,所以应选D）
2.A（the last APEC conferences指上一届亚太经济合作组织会议,是过去的事,所以排除C,B;同样,这个会议举办的动作时举办者发出的,对会议来说是被举办,过去时的被动语态结构为：was/were+过去分词,所以选A）
被动语态的构成：被动语态由“助动词be＋及物动词的过去分词”构成.人称、数和时态的变化是通过be的变化表现出来的.现以teach为例说明被动语态在各种时态中的构成.
一般现在时：am／is／are＋taught
一般过去时：was／were＋taught
一般将来时：will／shall be＋taught
现在进行时：am／is／are being＋taught
过去进行时：have／has been＋taught
现在完成时：have／has been＋taught
歌诀是：被动语态be字变,过去分词跟后面.

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