某同学用滚动铁环的方法来测学校花坛的周长。他测得铁环的直径为D，铁环绕花坛一周滚动的圈数为N，则计算花坛周长L的公式为L=_________。
πD·N
用所给动词的适当形式填空。
1. I ______ (talk) to some friends yesterday afternoon.
2. My mother didn't _______ (walk) in the park yesterday.
3. Did you ______ (play) table tennis last weekend?
4. —What did you do last night?
—I ______ (watch) TV.
5. Did you ______ (cook) fish yesterday?
6. Dad ______ (walk) in the park yesterday.
一个盒子中装有m个红球和n个白球，每个球除了颜色以外都相同，从盒子中任摸一球，若摸到红球的可能性大于摸到白球的可能性，则m与n的大小关系是______．
