_______is known to us is that time is limited and precious.
______from space, the earth with water _______70% of its surface looks like a “blue blanket”.
The colorful design _______ sixty candles and a flag will appear on the People Square on October 1.
In copying this paper, be careful not to _______ any word.
Who ________ a theory about black holes?
---How about your journey to Mount Emei? ---Everything was wonderful except that our car ________ twice on the way.