—I believe we've met somewhere before. —No, _________.
It is thought that meteories (陨星)may hold clues about the ________of life on Earth .
He is having a family party in ________of his 84th birthday .
It is important to know about the cultural differences that________cause problems.
When Premier Zhou Enlai was alive,he________work from morning until night every day,dealing with numerous affairs.
—May I tell this to my close friend?—No,you________.Never let anybody else know about it.