1 . Schoolchildren should be the main target for education because they are not only in their formative years but also the __________ eaters of fast food. (根据句意填空)
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2 . R________ exercise also cuts the risk of heart disease by 50%!(根据首字母单词拼写)
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3 . The equipment is checked on a r________ (定期的，有规律的) basis. (根据中英文提示填空)
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4 . You should work out at least twice a week. It's said that r________ exercise cuts the risk of heart disease by 50%. (根据首字母单词拼写)
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