The white-flag dolphin, ______ rare Chinese mammal, is in ___ dangerous state of dying out.
. The police were ___ the prisoner to see if he had a gun.
It’s bad manners to call ___.
It is _____ he often fails in exams ____ makes his parents worried about him.
What surprised me was not what he said but ____ he said it.
. The most of his time is ____ to prepare for the college entrance examination.