To their deep sorrow, there was nothing left ______ the city except ruins after the violent earthquake, which turned the whole city into a silent world

It was at the school gate ______ I met an old friend of mine after class.

We had hoped that you would be able to visit us, but you _____

"Is Mary from New York City ""I don’t know _______"

The student’s mind is always _____ when he listens to his teacher. [ ]