在短语'she smiled cheerfully'中，单词'cheerfully'是一个副词。

In the phrase 'she smiled cheerfully', the word 'cheerfully' is an ___adverb.

单词'quickly'是一个副词，用来描述某人如何跑步。

The word 'quickly' is an ___adverb that describes how someone runs.

在英语中，副词可以提供关于动词的更多信息，比如'she sings happily'中的'happily'。

In English, an ___adverb can give more information about a verb, like 'happily' in 'she sings happily'.