You must have read about Mark Twain long ago, ____?
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.
The other day, my friend John drove his car down the street at __ I thought was a dangerous speed, and __ surprised everyone in the car.