阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。
I volunteer some of my time in order to give back just a little of what I am so blessed to have. This month. I had an unbelievable opportunity to 1 my dream, and step out of my 2 surroundings. I volunteered to go to Guatemale (危地马拉) with an eyeglass.
Our 3 went to a small town in Guatemala. San Augustin. We 4 our tables and packages of pre-made 5in the dirt courtyard of a clinic, get up the Snellen chart on a wall, and began 6 people. Young and old, they came from many of the 7 town. Most had never had an eye exam before.
They waited for hours8 in the sun, never complaining. If we could help them out with a 9 pair of glasses they would feel deeply 10. Some only left with eye drops or sunglasses, and 11 these people were grateful.
We saw over a hundred 12 a day and a good part of those we saw got glasses. We 13over and over from people who knew their eyes 14help that they had not gone to a doctor because it was too 15, or had not got the glasses they needed for the same reason. We saw children who were16 out of school because they could not see the17, and we met women who could not see to thread needles, drivers with 18 seeing road signs.
We are not doctors, and there were several people we could not help. But for those we could, we watched with pleasure as their lives19. What a gift sight is and what a difference it 20to see clearly.
