While he was ______ about in the street, Mary came up to him.
I ______ walking in the garden ______ watching TV in the room.
The old man was the only person on the spot(现场), so the policeman asked him to _____ the facts as he remembered them.
Eric had received training in computer for one year _______ he found a job in a big company.
His teacher insisted that he ______ his hair ______ the next day.
How are the kids spending their childhood? I can’t help recalling(回忆)that there was a time _______ we played happily and freely in the outside.