September 10th is .A. Children’s DayB. Christmas DayC. Teachers’ Day
—Did they have fun _______ the summer Palace ? —Yes. They really enjoyed themselves there.
Frank wanted to learn to play _______ guitar, but he didn’t have _______ guitar.
There are a lot of colorful flowers on __________ side of the street.
It’s hot outside, please keep the door __________.
I didn’t know he came back __________ I met him in the street .