The house caught___fire last night but no one knows who set ___fire to it. A. X;X B.X;a C, a; a D, a; X
____ he was in poor health, he worked just as hard as everyone else.
We arrived at the station ____ the train had left.
___he daydreamed, Peter saw figures in the sky.
____ to New York, her father has not heard from her.
It looks ____ it's going to rain.