When it comes to gossip(流言蜚语), learn to keep your mouth shut ________ you'll avoid trouble.
We invited her to dinner but she didn't bother to ________.
________ the words,the daughter understood what her mother was trying to tell her.
This vase ________ perfect but for a few small holes in its base.
Tom sacrificed his personal life ________ he could get ahead in his career.
There is still a strong argument ________ mobile phones are a particular risk to children.