地理的两极和地磁的两极并不重合，世界上最早记述这一现象的人是我国宋代学者 ____．“郑和七下西洋”是我国古代航海史上的一项伟大壮举，这一伟大壮举的实现得力于 ____的发明

根据句意及汉语提示完成单词

①It's i____ to smoke in some indoor public space and special outdoor work space.

②The teacher came in while Tom was d____ litter on the floor.

③Please be c____ next time. Don't make the same mistakes again.

④The English program can s____ ways for us to take an interest in learning English.

⑤If you study hard, you can make great p____.

使用弹簧测力计，如果指针指在零刻度线下方就开始测量，所测拉力的大小与真实值相比（　　）x