答案：形容词: attentive，副词:attentively。

解析：副词意思是“专心地；注意地；聚精会神地；周到地”；形容词意思是“细心的；注意的；专心的；留心的；关心的；肯帮忙的”.

例句：

①形容词attentive:

The hotel staff are friendly and attentive.

旅馆人员友好而且照顾周到。

②副词attentively

He had his audience listening attentively.

他抓住了听众的注意力。