It even leaves the scientists in wonder ________ they should call the newly-born creature, which looks half-human and half-animal.[ ]

It was with great excitement one morning in July ____ the young man read a classified advertisement．

She speaks English fluently _____ she were a native American.

Do you know where David is I couldn’t find him anywhere.—Well, he ______ have gone far—his coat’s still here.

It __________ no difference to me whether their team can win the game or not.