In many places in China, the old over 90 not only by their family but also by the government.
I’m going ___ a picnic on Saturday.
It’s ten o’clock. The children are ___ a good time.
My father works in a ________.His students like him very much.
Jim can’t go to school ___ his parents have no money.
___ knows the way to the hospital so we have to ask the policeman for help.