It was reported that the government official expressed the deepest ______ to the families of those killed and injured in this attack.

Please read the _____ on the bottle of the medicine carefully and pay attention to the amount and the time to take the medicine．

Scientists have found no ________of life on Mars so far,though great efforts have made on the research.

 You may go to the ________ if you want to watch Peking Opera. 

At the meeting, the professor presented a new __________ to foreign languages.