四、阅读短文,从方框中选择适当的词或词组并用其正确形式填空,使短文通顺、意思完整。(每词或词组限用一次。)
warn at stay while worry about
I was reading a book at home when it started. 16. first, I heard a loud noise of the wind. I looked out of the window, but I couldn't see anything clearly. People outside were screaming 17. they were running to shelters(庇护所). I felt nervous because I was in the house by myself. I turned on the TV, and the TV host was 18. people to stay inside.
Finally, the sandstorm stopped. I opened the window to look outside, and I saw everything was yellow. However, it was brighter and clearer outside than before.
I still 19. my parents. After I called my father, I soon heard his mobile phone ringing outside the door. I opened the door, and they entered the room quickly. They said, "What bad weather it is!" I thought they were right. We decided 20. at home for the rest of the day.

16.At 17.while 18.warning
19.worried about 20.to stay