He was riding to school it began to rain.
Beijing is ______big city and it’s ________ capital of China .
This is a bridge _______ the river and there are many boats _______the river .
---Hello! Who’s that _______ ? ---This is Mary . I’d like to ______ to Andy about tomorrow’s trip.
---_______ they _______ have a meeting this weekend ? --- Yes , they are .
Peter has a swimming pool .It _________ long.