---Which is ______, the sun, the moon or the earth? ---Of course the sun is.
There a football match this afternoon. Shall we watch it?
Would you like to help me _____ my English?
There are three______ workers in this factory. My brother is in it ,too.
Is therewrong with my computer? No, it works well.
The boy, _______ his father, ____ playing basketball.