Jenny dare （) （not walk) （请调整为合适的形式)alone at night.
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You may go on staying here,（) （suppose的合适形式)（假如) you pay the rent.
It's my first time to give a speech ____ （介词)public（当众).
We should apply what we've learned from books ____ （介词)（把 ...... 应用于) the task.
When I （) （be) a child, I often swam in the river.
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