The professor has given us _______________ advice onhow to improve our memory.

People nowadays spendthey used to buy less food, especially meat.

Surely it doesn’t matter where the studentassociations get their money from; what _______ is what they do with it

My best friend Jack looks happy, and he always ________ a smile ________ his face.

(2013·江西，25)Only when he apologizes for his rudeness ________ to him again.