—Such a mistake could have been avoided. —Unfortunately, he ________ the mistake again and again.
— What caused the party to be put off? — ________ the invitations.
Nowadays many parents are trying to either prevent their children from failure, or protect them from the knowledge ________ they have failed.
From the tears in Nedra’s eyes we can conclude that something sad _________.
But for my teacher’s help when I was in the senior high school, I ________ in Fudan University now.
There will be a bow and arrow competition _________ to retell ________ the Plains Indians used to hunt for food.