Many approaches have been to control the spread of H7N9 Bird Flu.

.—Hurry ! It，s high time that we____to school. —- Oh, if only the alarm clock____earlier.

The fact that many college graduates get lower salary than some workers has ________ an online debate.

Compared with the nervousness of driving in the rain or snow, it is ______ to sit in a train without any worry of bad weather.

About 22.4 percent of all homes in urban areas were lying vacant in China in 2013, the vacancy rate was 1.8 percentage points higher than ________ of 2011 according to the survey.