When _______, water will be turned into steam.
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。
Theoutlineofrooftopsandchimneys________againstthepalesky.
Duringthepasttwodecades,researchhas________ourknowledgeofdaydreaming.
YouarethemostdirectyoungwomanIhaveever_______.
Basically，theseattitudesamounttoabelief________leisurecanandshouldbeputtogooduse
Fishis________andexpensiveatthistimeoftheyearinthisarea.
