Professor Li preferred _______ lectures to his students to _______ to meetings on scientific developments.

You’d better        fatty food if you want to stay slim

His father is a laid-off worker with a total income of around 300 yuan per month, which ________ only the basic needs of his family. 

We have very strict quality control and anything imperfect is________，so customers feel secure about our products.

Recently our class held a fierce ________ as to whether to raise the price of school meals or not.