Mother needs (add) ____help in the kitchen on weekends.
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There (be) ____no cause for worry, the driver went ahead towards his chosen destination.
So why did you open a letter that was (addressee) ____to me?
She made a few minor (adjust) ____to the focus of her camera.
地球表面陆地按照面积大小的不同,大体分为__________和__________。