—Have you ever________to a zoo?—Yes,but only once.I visited Beijing Zoo last year.
Chinese is used ______ the largest number of people in the world.
The woman has something wrong with her eyes and has to have them _________.
Our friends were _______ busy ______ with each other _______the time.
---He has ______ little education that he can’t teach _______ little children.
Beijing is _________ capital of China and it is _________ city with many places of interest.