I_______buy a new pen because there there is no pen in my pencilcase.

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I_______buy a new pen because there there is no pen in my pencilcase.

I_______buy a new pen because there there is no pen in my pencilcase.
I_______buy a new pen because there there is no pen in my pencilcase.

I_______buy a new pen because there there is no pen in my pencilcase.
have to/must

need to 需要
should 应该
这里都可以

must 必须
我必须买一支新的钢笔,因为我的笔袋里没有钢笔了

have to