Is it true ____________ the new drug takes effect, the child with cancer will have a slim chance of survival?
We should consider what use can we make ______ such material.
He commanded the students ______ the classroom before he returned.
–How about _______ Christmas evening party? _ I should say it was _______ success.
No sooner _______ the competition _______ _______ an unexpected accident happened.
Not until he took off his sunglasses _______ him.