The roof fell ____ he had time to rush out.
the difficult maths problem, I have consulted Professor Russell several times.
________ village where I was born has grown into ________ town.
Ralph W. Emerson would always ______ new ideas that occurred to him.
No soonerstepped on the stage than the audience broke into thunderous applause.
— You know, I met my girlfriend’s parents for the first time only yesterday. — ________? I thought you’d met them before.