完型填空（首字母以给出）
There is nothing m___ important than the sun.Without the sun all the l____ things on the earth will die .The sun is a star.In the sky there a____ many stars like the sun.They are as l____ as the sun and as hot as the sun.A____ night ,you can see many stars,but i____ the daytime,you can see only one star-the sun.
The sun is much n____ to us than any other stars.That's why it looks the biggest and brightest of all the stars.The distance of the sun f____ the earth is as much as 150 million kilometers.Most of the starts are thousands of light years a____from the earth.
Do you know what is the light year?Nothing in the world travels f____ than light.It travels 300,000 kilometers a second.And one light year is the distance that light travels in one year.