用英語造句。

It's our duty to protect the saplings. 保護樹苗是我們的責任。You have to pay duty on this.妳必須為這項物品繳付稅金It's my duty to help you.幫妳忙是我份內該做的事 He is in a smart suit today.他今天穿著壹套時髦的衣服This boy is very smart; he may be another Edison.這男孩很聰明，他可能成為另壹個愛迪生。Why do smart people make bad decisions?為什麽聰明的人會做出壞的決定? This is a key problem to solve.這是當前要解決的關鍵問題。I think I can solve the problem.我想我能解決這問題。Life is a puzzle—solve it.生活是壹個謎語，解開它吧 She is generally regarded as one of the best writers in the country.人們普遍認為她是該國最優秀的作家之壹She regarded him thoughtfully.她若有所思地看著他。I never regard myself as an expert.我從來不認為我自己是專家。 If you can't sign your name, make a cross instead.妳如果不會簽名，畫壹個十字也可以I want you go to the meeting instead of me.我想要妳代替我去參加那個會議If you have no cream, use milk instead.如果沒有奶油，就用牛奶代替