'IT' + 'BE' + ADJECTIVE + 'FOR' + OBJECT + INFINITIVE

按时完成作业对学生来说很重要。

It's ___important for students to finish their homework on time.

让他一天之内学会弹钢琴是不可能的。

It's ___impossible for him to learn to play piano in one day.

许多人认为公众人物吸引媒体关注是意料之中的事。

Many people think it's ___natural for public figures to attract media attention.

登机前，所有旅客都需要出示护照。

It's ___necessary for all passengers to show their passport before boarding.

仪式太长了，孩子们很难一直安静坐着。

It was ___difficult for the children to sit still during the long ceremony.