inese abacus, officially ______ as a cultural heritage at the 8th Annual UNESCO World Heritage Congress, is another symbol of Chinese wisdom.

Excuse me, Where is the zoo—Sorry, I don’t know. Ask that policeman.He ____ know.

He said that his friend ______ there three days before, but she was not there_______

How do you ________ your long absence from classes without asking for leave?— I have nothing to say.[ ]

The young man made a ______to his parents thathe would try to earn his own living after graduation.