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Some students in middle schools like playing computers．They think
(1) can help them learn a lot of things．But sometimes
(2) computers is bad us．If we play computers for too
(3) ，it is not good for our
(4) and health．Some students spend too
(5) time on it．They don"t do
(6) homework carefully．Some students play it too
(7) ．They can"t have a good rest at night．In class，they can"t
(8) the teachers carefully．They are not good at their
(9) ．So computers are
(10) ，but don"t play too much．