_____he come, the problem would be settled.
Jack reached the company out of breath, only _______ he was fired.
There are several research centers in China ________ a certain disease called Bird Flu is being studied.
I ___ the French written papers but failed in the English oral examination.
______ alone in a dark room, the little girl was so frightened as to cry loudly.
— Thanks for your help.— Don’t mention it. I _______ offered some advice.