He‘s working hard_____.
B
forfear(that)“惟恐，以免”，引导的从句用虚拟语气should+动词原形，should可省略。lest意思及用法类似。
It‘s_____mypowertomakefinaldecisiononthematter.
Ifhe_____thestorekeeper‘sscissors，hewouldhaveforgottentobuyapair.
Hewasvery_____togo，buthehadnochoice.
Itwasnotuntilshehadfinishedallherwork_____.
Hedidn‘tseemtomind_____themusicwhilehewasstudying.
