—Do I need to give a tip if I eat at a fast food restaurant in the United States? —Yes, it’s a common ______ to tip waiter in a restaurant.

Thanks to the vivid ______, the speaker made the abstract concept accessible to all the audience.

The naughty boy spoke in such a______as to make the teacher very angry.

Chinese arts have won the ______ of a lot of people outside China.

I’ve listened to Professor Smith’s talk about medicine,but I still haven’t got a good understanding of its key _________.