No one knows for certain how the first Americans arrived in _____ is now the United States.
Serveral pairs of old shoes need ___.
---____? ---The famous singer Sog Zuying will come to our city.
The North Pole is ____ all the white snow here and there all the year round.
The player kept on running ___ it was raining heavily.
---Hello.May I speak to Lucy?---_____! Please…I’m afraid she is ____.