do…while循环语句的while后的______ 不可以省略。
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3. The stars and stripes ______ (is, are) their national emblem.
Forty divided by eight ______ (is, are) five.
Home is home, ______ (be) it ever so homely.
He suffers from diabetes, which ______ (is, are) a kind of chronic disease.
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