She was halfway to the cinema where her mother was waiting____John caught up with her.
A. when
B. while
C. until
D. though
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We see the lightning _____ it appears, but we hear the thunder a moment later.
A. the instant
B. for an instant
C. on the instant
D. in an instant
_____ the world began,it has been difficult for nations to keep peace with their neighbors.
Although
B. When
C. Until
D. Ever since
Yesterday morning a prisoner escaped from the prison. It was a long time _____ the guards find out what had happened.
A. before
B. until
C. since
D. when
The sound of the piano became fainter and fainter _____ it was not heard any longer.
A. since
B. after
C. until
D. as soon as