—I doubt if he __________ to the party with us tonight.— I believe if he __________ his homework, he will go with us.
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.