问题描述：
it's time for us to go to school.（ 同义句转换） we must
it's time for us to go to school.（ 同义句转换）
we must go,or we will＿ ＿ ＿school
it's time for us to go to school.（ 同义句转换）
we must go,or we will＿ ＿ ＿school
问题解答：
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