A: I hear you give preference to Lily in your class.
B: Yeah. Though I know it's wrong, I can't help making a favorite of her.
A: Does she always get the highest score?
B: Yeah. and she's very modest and polite.
give preference to
e.g. To prioritize someone or something above someone or something else. （偏向......，优先选择......）
e.g. Preference will be given to graduates of this university.
e.g. We give preference to applicants with some experience.
e.g. You' ll get on well as long as the boss gives preference to you.
e.g. Every family has one child to whom the others think is to be given preference .
cannot help doing something：禁不住做某事
e.g. I cannot help feeling very anxious about his frail body and another operation.
e.g. He cannot help feeling considerable qualms about it.
make a favorite of someone：宠爱某人
get the high score：获得高分