— Long time no see!— Yes, we haven’t seen each other _____ May 4, 2009.A. since B. in C. on
He looks very pale. He may have _______ fever.
When the traffic lights are red, we _______ stop.
—Oh, you have a headache and a cough. __________ have you been like this? — Two days.
Would you mind _________ the piano softly ?
I often see the girls ________ in the room. They are very pleased.