The Chinese abacus(算盘), officially ______ as a cultural heritage at the 8th Annual UNESCO World Heritage Congress, is another symbol of Chinese wisdom.
What animal can live both ___ land and ___ the water.
Mr Chen was ___ early thirthies when he went abroad to have his further studies.
Children often get presents ___ Christmas and ___ their birthdays.
You can find the new hospital ___ the end of the street.
___ the end of this new term we'll have graducated from middle school.