I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .

Last week, they held the charity show to raise money for the ______ of the earthquake.

My teacher gave me much ________ on how to study English well when I had some trouble.

Tina went to the park yesterday.In the park she felt hungry and bought ______.

—What would you like to drink, girls?  —          .