l remember that terrible accident a few days ago, ____ more than 20 pupils were killed.

1If you don’t work hard formost of the year and then work hard for only a few days before the exam, youwill probably .

WashingtonD.C（华盛顿）is ____of America.

The man _____ bravely _____ the Japanese during the Anti-Japanese War.

More often, the air in Hangzhou is dirty because of _____.