—How's your project going,Jack?—________.I'm half finished with it.
It is not surprising that you are tired. _____, you stayed up until 12 last night.
_______ being fun and good exercise, swimming is a very useful skill.
It was not until she got home __ Mary realized she had left her books in the classroom.
The train was ten minutes late, so I _______ have run all the way to the station.
. Jay Chou is _______ that teenagers are all crazy about him.