Tom, you’ve got a "D" in chemistry.____?—Well, I find the subject hard and I think I’ll drop it for history next term.
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 .
______ he finished his work , he left hurriedly.