请根据中文及括号内的提示翻译下列句子
【小题1】香烟含有很多影响健康的化学成分，这是众所周知的事实。(contain)
【小题2】尽管多数人都认为他的目标不切实际，他确信他可以通过努力达成目标。(achieve)
【小题3】我不愿意每周末都照看我那淘气的侄女，但是我母亲坚持我得这么做。（watch over）
【小题4】后来，我们一致同意，最重要的是歌迷的喜欢和执着使得他的事业成功。（above all）
【小题5】Jack，就是昨晚和我一起去听音乐会的那个人，自从被这所大学录取后就想当一名有吸引力的音乐家。（定语从句；since）It is a well known fact that cigarettes contain many chemicals which will affect your health.
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(答案→)It is a well known fact that cigarettes contain many chemicals which will affect your health.
解析：
【小题1】这是众所周知的事实：可以用同位语从句It is a well known fact that cigarettes contain many chemicals which will affect your health.
或it做形式主语，用that引导真正的主语从句：It is well known that cigarettes contain many chemicals which will affect your health.
也可以用as引导非限制性定语从句：As is known to all, cigarettes contain many chemicals which will affect your health.
【小题2】用Although 引导让步状语从句，不切实际not realistic 和unrealistic ，认为…是…,considered sth to be , he was sure that引导的是宾语从句 he could achieve it with hard work.
【小题3】考查词组：照看： watch over 还有insists that 从句中用虚拟语气的用法I (should) do it.
【小题4】我们一致赞同： we agreed that 引导的宾语从句：above all最重要的是，made his career successful.使他的事业成功。
【小题5】考查定语从句：介词with可以在which前面，也可以放在定语从句中，Jack, with whom I went to the concert last night（ who/whom I went to the concert with last night,） dream of doing梦想做…,时间状语从句是：自从被这所大学录取后since he was admitted to the university.