You have to ____ a choice. Are you going to leave the job or stay? [ ]

Luckily, _______ happened to be no one in the building when the terrible fire broke out[ ]

下列各句中加点虚词的意义和用法相同的一项是（  ）

What about ______ bike — Don’t you thinkit all right to buy him that bike as _____ birthday gift

Mary felt sad over the loss of photos she had shot in Australia, ______ that was a memory she especially treasured