Scientists study ____ human brains work to make computers [ ]

Jack does his homework ________ Mary. So theyboth always get good grades in the exams.

He told me that he had mailed part of the samples样本 and that the rest _____ in a few days.

Mary believed it was just the license number that she had chosen ___brought her the good luck

is it from the park to the supermarket—It is about fifteen walk.