—Your mother becomes more and more forgetful. —Yes. She searched for her cellphone for a whole day last Sunday but it ______ in her coat pocket the next day.
—Do you know ____ the 2011 Xiamen International Marathon was held? —On January 2.
Scientists across the world agree that this is an invention of ____ great significance, ____ invention that will greatly change human life.
---Excuse me, Dad, but I am going to the club to meet my friends in the football team. ---OK.
It is well known to us all that a lot of rivers _______by factories.
I feel ____to have been invited to give a speech here.