It was in Beihai Park _____ they made a date for the first time ______ the old couple told us their love story.
He always talks _______ he had been to outer space.
You’d better come back earlier _______ it is getting colder.
He was walking along the sands _______ he saw a big foot-print in the sand . A. whileB. whenD. asD. after
_______ he was sleeping , they stole his clothes.
Jack was very tired _______ he played tennis all afternoon .