【江苏省淮安市2015年中考英语试题】Helen is friendly and she always has a smile _____ her face.
The story _______ about fifty years ago.
He arrived____ London ____ a cold winter night.
When I walked past her room, I heard her _______ an English song.
Keep the machine _______, and you will know how it works.
—What was Tom doing _______ it was raining? —He was doing his homework in the bedroom.