根据短文内容，用方框中所给词的适当形式填空，并用其正确形式填空，使短文完整，正确。（每个词只能用一次；共10分，每小题一分）

Light travels at a speed(速度) which is about a million times faster than that of sound .
    One second, light travels about 300000 kilometers, but sound travels only 340      .  You can get some idea of this difference by ________ the start of a running match. If you stand far away from the starter(发令员), you can see smoke________ from his gun before the sound reaches your ears.
The      speed of light produces some strange facts. The     star is so far away that light which you can see from it tonight started to travel to you  four years ________ at a speed of nearly two million kilometers every minute. The light from some of tonight's started on ________ journey towards you even before you were born.
So, if we want to be honest(诚实), we can not say , " The stars are shining ________tonight."  We have to say, " The stars look nice. They were _______ four years ago but their light has just reached our earth. "