阅读下面材料，在空白处填入适当的内容 (1个单词) 或括号内单词的正确形式。
Maybe you always wonder why your pocket money disappeared so quickly. Well, this may be ____you don't have a careful plan. If you try a budget for your pocket money, you will find you can stop money ____ going so fast. A budget is a plan to control where your money ____(go) . Careful budget can help you save for the things you want but can't pay for just now. Useful or not? Look at the ____ (follow) before you start your budget:
● Every month there are things we have to pay for, like school lunches and buses，which are____ (important).There are also things we would like to spend money on — just for fun! All these are ____ (month) expenses (开销).
● Since we can't have money for everything, we have to make ____ (choose). We need to ask if we really need something or just want it. Needs are what you must have in order to live, like food and water. Wants are things you would like to have or do, but not necessary. For example, CDs and cartoons.
● List what you must spend on needs — and if there is money left, you will save for things you really want. This ____ (call) a budget.
● If you don't have enough money for what you need, you may have to give up one for the other. No budget is fixed. Keep an eye on ____ (you). Maybe you wanted a cartoon book but now you want____ MP3 . Your needs may change into wants, or your wants may change into needs.
的焦点在
轴上，长轴长是短轴长的两倍，则
的值为（ ）
和 
代表不同元素的原子。 