下列各句中，加横线的成语使用最恰当的一句是（ ）

. —Where did the couple find their child—It was in the park_________ the family used to camp.

____ all their money, so they have towalk home.

Some of the texts have too many new words and expressions _______ are hard for me.

I stood there wanting to ask more questions but found that was not the time.