He ____ （动词 spend 的合适形式)（花费了多长时间)10 days making this model.
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Tom （) （leave) home for school at 7:30 every morning.
Jenny dare （) （not walk) （请调整为合适的形式)alone at night.
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).
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