下列各句中，没有语病的一句是（????? ）

y lost his key, so he has no choicebut till his mother camehome．

He was beaten by his father because of being naughty____________, he became silent.[ ]

下列各句中，加点的成语使用恰当的一项是

They were determined to carry out the plan at first, but then we ________ persuade them to change their minds.[ ]