My neighbor is very kind. I’ll never forget the ______ she’s done for me.

A new _______to teaching English is being used here, and it has proven to be very helpful to the students. 

He made a _____ of five thousand dollars on the deal.

The children are full of ______. They have been playing all day long without resting.

David gave us a vivid            of his trip to Mount Huangshan after his return.