It is said that the old coinsunder the earth for about 100 years by the time they were discovered

So sudden ________that the enemy had no time to escape.

The weather here is different from ________ in Beijing, but the people here are as friendly as _________ in Beijing.

Some scientists think there are _______ 2，000 million flashes oflightning per year.

_______Lucy come from America —No. She _____from America. She is English.