In our opinion, teaching a foreign language is science.
My grandmother is over 90 years old, ______loss of memory.
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.