Choose the words or expressions and complete the passage.

　　Last Sunday I saw the worst storm in years. At first, the sky grew 1 suddenly. Within minutes, forks of lightening forced a way in the sky. Then it was followed by the boom of 2 . A very strong wind blew into my room. My valuable notes 3 high into the air. I jumped up to 4 them but unluckily a few sheets sailed out of the open window. As I ran out to get the notes, big drops of rain began to 5 . As soon as I ran into the house, the 6 began to pour in waves. I fought to close the windows. I did it but was wet all over. Then I heard a sudden loud 7 from the back of the house. A tree was broken.