根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Sometimes willpower is a lot like the television remote control—hard to find just when you want it most. ____ But there are ways to increase your willpower.

    *Don't try to change your economic situation, win a promotion or lose weight all on the same morning. Set one clear, specific goal and make a realistic plan to achieve. Extra willpower sometimes requires extra energy, so don't spread yourself too thin. ____

    *Whatever your goal is, don't expect to achieve it overnight,____If you are trying to kick a coffee habit, start by replacing your morning cup of coffee with a glass of water, instead of promising never to drink coffee again. Congratulate yourself on the small achievements. These successes help your willpower grow.

    *____ Ask friends, family or colleagues for assistance and tell them exactly how they can help. If your credit card bills have risen, for instance, let friends know that you are cutting back on expenses. Suggest having a common dinner instead of meeting at an expensive restaurant. Find a support group or organization related to your goal and attend their meetings. You can get valuable advice, understanding and information.

    *If possible, change your environment to encourage positive behavior. Want to get in shape? Keep an extra set of workout clothes in your office as a reminder to stop by the gym on the way home. Quitting smoking?____

    Every fast-food employee knows that the drive-through window is the worst position. The window sticks with constant ice; the roar of engines hurts your 1; your words are lost in the howling wind.

    On a 2 afternoon, everything changed.

    Every once in a while, the sub-zero temperatures seal a 3 windows shut. Drivers don't exactly enjoy having to stand outside in the cold, 4 their orders into a speaker box, when they expect to drive through on their heated leather seats. In such cases, most customers tend to show their annoyance to the employees.

    This woman was 5.

    “I'll get the next car's 6 as well,” she said as she came up to the window to pay. She stood outside, 7 much snow on her hair. Though she was obviously freezing, her bright 8 lit up her face like a fire.

    “You can't 9 their drinks,” I said, confused and tired.

    “No, but I'll buy them,” she said. “Pay it forward and all that.”

    Completely puzzled, I charged her as 10, and when the next customer arrived at the window I explained what had just happened. I watched as his 11 changed — first angry to be out in the cold, then 12 at the random act of kindness, and finally, delighted by his 13.

    “I suppose I'll pay for the next order then,” he replied, nodding and waving at the impatient driver 14 him. He 15 over the cash and received his pre-paid hot drink. The trend continued. Customers arrived annoyed, only to leave 16 and pleased. Some were shocked to spend much more than they had expected, 17 others ended up receiving their order for less than half the price.

    Five vehicles passed, then ten, then twenty. No one refused to pay. Customers stood at my window 18 a fist-full of change to buy drinks for a complete stranger. Cars drove off, honking (鸣笛) and 19 their thanks.

    It only takes one customer, one person, to change the entire 20 of traffic. It only takes one moment, one smile, to warm up even the coldest of days.

空气成分中，体积分数最大的是（　　）

—yes, I'm afraid I really_____.

8.65中的8在____位上，表示____个____，5在____位上，表示____个____.