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。
Theteachergave_____theexaminationpaper.
Thedriverpulled_____atthetrafficlights.
Thegirlwhofoundtheringreceivedagenerous_____offivepounds.
Idon‘tfeellike_____anythingnow.
Two-thirdsofhisproperty_____lostinthefire.