When_______,waterwillbeturnedintosteam.
A、heatedA
水被加热时会变成蒸汽。因为主句主语 water 和从句谓语 heat 的关系是被动的，所以用过去分词。
Ayearlater，withthenation’seconomy________，Bush’sapprovalratingdroppedbelow40percent
Robotsdifferfromautomaticmachines________aftercompletionofonespecifictask，theycanbereprogrammedbyacomputertodoanotherone.
Hewasspecificallyaskedtowriteaplaythatwouldbe________tothelocalcommunity.
Itisvitalthatthework_______intime.
Thisisthemostbeautifulvillage_______Ivisitedtheseyears.
