Perhaps you could eliminate them entirely, or if you're having trouble with that, maybe try to turn them into very short, very tiny " um" s, which have less of an impact on your score.

也许你可以完全消除它们，或者如果你觉得太难做到，可以试着把它们变成非常短、非常小的“嗯”，这对你的分数影响较小。