If we leave right away,__________ we'll arrive on time.
It was with great joy ________ he went to Shanghai to work as a volunteer there.
Tom said that he was late because he ________ in the elevator.
His parents told him ________ too much about what others said.
________ his appearance, he is most probably a new teacher.
After teaching in Bejing for five years, he returned to the small town ________ he grew up as a child.