Collocations for remain - verb

Remain is used with these nouns as the subject:
cause, challenge, danger, difference, disagreement, doubt, expression, fact, hope, inequality, loyalty, mystery, myth, possibility, problem, puzzle, question mark, scar, situation, suspicion, trace, tradition, uncertainty, unemployment, weather

Remain is used with these nouns as the object:
case, challenge, classic, exception, favourite, focus, force, friend, fugitive, mystery, obstacle, possibility, problem, province, puzzle, secret