这首曲子用A小调演奏，听起来很忧伤。

The piece is played in ___A minor, which sounds very melancholic.

这只是个次要问题，不会影响整体计划。

This is just a ___minor problem that won't affect the overall plan.

未成年人需要家长陪同才能观看这部电影。

___Minors need parental supervision to watch this movie.