You may go on staying here,（) （suppose的合适形式)（假如) you pay the rent.
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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.
Mary （) （not be) （请调整为合适的形式)a teacher.
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