We won’t give up ______ we should fail twenty times.
The young couple,who returned my wallet,left _____ I could ask for their names.
It was really a great to all the teachers and parents that no students were injured in the accident.
According to a recent survey, homework is ______ students most often blame for their lack of sleep.
All the books donated by the students from urban schools are said ________ to the students in the earthquake-stricken areas the other day.
I will be surprised if you can get Calvin, who is a close-fisted man, ________ these donation draw tickets from you.