Was it midnight_________ you fell asleep while reading with the candle still burning?
The college entrance examination is coming, the students are _____ it.
This is the school _____ they visited last year and is the one _____ my father once worked.
The enemy troop suddenly took the small village by surprise _____ a rainy morning.
--What is the model plane look like? --Well, the wings of the plane are _____ of its body.
Is this research center _____ the foreign guests visited last week?