—Recent pressure at work may ______ his behavior.
The boys followed the marks that they ______, until finally they found their way back to the campsite.
He won’t apologize to us ______he is wrong.
__________the truth, we’re sure she won’t tell a lie.
Mr. Baker including some tourists ______ the Great Wall before, so they headed for the Forbidden City.
One reason why he succeeds is ______he is good at thinking in different ways.