Weregretto________thatitmaynotbepossibletodealwitheveryrequest.
She________hernervousnesstotheimportanceoftheinterview.
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
Insomeschoolschildrenwhoprefertoreadbooksratherthan________footballbecomesocialoutcasts(被抛弃者).
________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.