Don’t put your hand out of the car window, ______ you will be hurt by the passing traffic.
The accident happened _____the old man _____ a cold morning .
This is Mr. Green’s ________visit to America. He has never been there before.
---Are the Smiths living in the house alone ?--- Yes, although they have three sons, _____ of them live with their parents.
Kate has a beautiful _______ . Listen ! She is singing very well.
After school, they usually play _____ football for an hour on _____ playground.