_____, the fire was discovered soon after it broke out , otherwise it might cause much greater damage．

 John had planned to make a compromise， but      he changed his mind at the last minute.

 Our neighbor has ______ ours. 

Recent studies have discovered that fathers uniquely contribute to the development of their children, _____ in low income families.

The airline stewardess (空姐) said to passengers on ______ with a beautiful smile, “welcome _________!”