用英语造句。

It's our duty to protect the saplings. 保护树苗是我们的责任。You have to pay duty on this.你必须为这项物品缴付税金It's my duty to help you.帮你忙是我份内该做的事 He is in a smart suit today.他今天穿着一套时髦的衣服This boy is very smart; he may be another Edison.这男孩很聪明，他可能成为另一个爱迪生。Why do smart people make bad decisions?为什么聪明的人会做出坏的决定? This is a key problem to solve.这是当前要解决的关键问题。I think I can solve the problem.我想我能解决这问题。Life is a puzzle—solve it.生活是一个谜语，解开它吧 She is generally regarded as one of the best writers in the country.人们普遍认为她是该国最优秀的作家之一She regarded him thoughtfully.她若有所思地看着他。I never regard myself as an expert.我从来不认为我自己是专家。 If you can't sign your name, make a cross instead.你如果不会签名，画一个十字也可以I want you go to the meeting instead of me.我想要你代替我去参加那个会议If you have no cream, use milk instead.如果没有奶油，就用牛奶代替

duty (n.) Who is on duty today? I am on duty today. It's my duty to heip you.smart (adj.) The little boy looks smart. Panda is not a smart animal. Monkeys are smart animal.solve (v.) Can you solve it yourself? The method to solve this problem is being discussed by now. It has been solved .regard (v.) We regard him as a member of my family. We regard him highly. We regard the situation serious.instead (adv.) I will look after you instead. I don't have a pen, so I use a pencil instead. If you can't come, we will ask someone instead.

It's my duty to do so.You are so smart.How to solve the problem?I have no idea in regard of this thing.I like apple instead of banana.