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1．我每周鍛煉三次。         I exercise _______ _______ every week．

2．假期你打算做什么。     What are you doing _______ _______?

3．我經(jīng)常步行，但有時乘公共汽車。     I usually walk but sometimes I _______ a _______．

4．非常感謝你的邀請。                   _______ very much for your _______．

5．我們的教室比他們的干凈。        _______ classroom is _______ than theirs．