— Generally speaking, light ___ faster than sound. — Yes, it is a rule.
On the night of February 14th, 2011, all the Chinese _________ by Guo Mingyi, a very common worker who ________ more than 180 poor children since 1994.
The Nanjing Yangtze River Bridge is still very strong, ___________ it is almost 43 years old.
—__________ do I have to change the robot’s batteries? —Every two months.
Mr Chen __________ his mobile phone to the shop because it can’t work at all.
Computers have made a great difference _______ our everyday life.