完成句子(用名词从句)
________________(他们什么时候动身)hasn'tbeendecidedyet.
________________(Tom去哪儿了)isnotknownyet.
________________(他是如何成为一个科学家的)isknowntoall.
________________(人们为什么干这件事)wasn'tquiteclear.
________________(你所告诉我的)reallytrue?