动词不定式与疑问副词和疑问代词连用时,在句中可以做主语、表语、宾语怎么造句

what to do next is still unknown.
how to get so much money is the most difficult problem.
our puzzlement is how to finish the job in two days.
the problem is where to build the factory.
we don't know what to do next.
he wondered how to do it better.