When _______, water will be turned into steam.
A
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。
A year later，with the nation’s economy ________，Bush’s approval rating dropped below 40 percent
Hewasspecificallyaskedtowriteaplaythatwouldbe________tothelocalcommunity.
Duringthepasttwodecades,researchhas________ourknowledgeofdaydreaming.