Leave your key with your neighbor ________ you lock yourself out one day.(2012·辽宁)
It is requested that the machine be operated according to the________.
-Mary,could you please post the letter for me while you are out? -________
Tom's first job was at a local restaurant in his early twenties,________he worked for seven years.
She felt ________ awkward because of her bad performance on the stage.
More and more carbon dioxide is being released into the air,________the more severe global warming effects.