The water of the Miyun Reservoir is regularly ______ to ensure the security of Beijing people’s drinking water.

276. Computer technology has _____ a revolution in business practices. Which of the following words is not suitable to be put in the blank?

_____ will your parents come back from Hong Kong–In a week.

Please do me a favor—–_________ a seat for me in case the hall is too crowded

Mum,I volunteer my time the plates.