依次填入下列各句 横线处的成语，最恰当的一组是①在义工联盟中，他不仅是发起人、带头者，更是义工精神的实践者、坚守者，时时处处都 ，亲力亲为。②不管日方如何 、绞尽脑汁、变换手法宣传自己的错误立场，都改变不了钓鱼岛属于中国这一基本事实。③他 地寻求国画艺术的发展道路，多方探索，力求变化创新，在挥毫泼墨中抒发画家丰富的思想感情。

No one________ be more generous；he has a heart of gold.

Of all the subjects, chemistry seems to be for me.

My ink has . Can you spare me some, please— Of course. Here you are.

munication, a smile isusually strongsign of a friendly and open attitude