面对某市政府启动的“植树增绿行动”，市民潘某决定“收声做事”，一是实地调研了解种树决策的合理性及其缺陷，二是给政府有关部门打电话询问情况并表达态度。潘某的“做事”启示我们（    ）

依次填入下列各句横线处的成语，最恰当的一组是（    ）

①面对参加寒假集训的60名大学生，海江集团总经理张子平老师对海江创业历程 ____________________，神釆飞扬，他的悉心讲解引起青年们阵阵热烈掌声。

② 面对中外记者的提问，***不慌不忙，__________，让国人看到了一位睿智的领导人形象，更让世界借助媒体看到了大国领导人的风范。

③设计师要对施工工艺、材料等无所不知，只有这样，在客户面前才可以________________，问即答来，才能贏得客户的信任，才能跟客户签下合同。

    There are many ways you can save money at the supermarket . Here are some of the best:

    Make a list and follow it.

    The list is about your needs: the notebooks you're out of and the food you need for daily meals. When you buy the things that are not on the list, you are wasting your money.

    Compare the prices.

    The biggest package isn't always the cheapest. Sometimes it is cheaper to buy in bulk*. So it's useful for you to compare the prices.

    Ditch the basket or cart.

    If you're going to the supermarket just to pick up milk and bread, don't use a basket. Baskets let people to buy more. Only use a basket or a shopping cart if it's really necessary.

    Make one large trip instead of several small ones.

    Each time you enter the supermarket, you get another chance to spend. By reducing the times of your trips, you're saving both time and money.

    Shop when you are full.

    If you go to the supermarket for milk on a Sunday morning without eating breakfast, you are likely to come home with bread, sandwiches and orange juice.

想要改变单摆的摆动速度，可以改变单摆摆锤的重量。