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--Is this bag Betty's?---No,it's not ___.it's Tina's.

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We are working hard on ____(we) project.

My flat is on the third floor。 ____ (they) is on ther tenth floor.

The umbrella is _____(she )。 _____(it) colour is purple.

最常用的数字式仪表显示器有______和______。

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