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1、Challenge
(1)Challenge sb to do sth 。向…挑战，邀请…比赛
They challenge us to a swimming contest.
(2)to give (accept) a challenge ( 接受 ) 挑战
2、Share
(1)Share 部分，分
Everybody ought to have his proper share.
(2)Share 参与、贡献
I had no share in the mater.
(3)Share (with，between) 分配，共有
They shared the profits between them.
I will share with you in the undertaking.
3、Instead
(1)instead 代替
If you cannot go，let him go instead.
(2)instead of 代替
I will go instead of you.