It’s natural that I didn’t recognize her immediately I saw her. _______, it’s almost 5 years since we met last. 

Where    go to spend our summer vacation this year?

A giant helium(氦) balloon is telling residents of Paris how good or bad the air quality is. When it’s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green. _________, it’s red.

_______, the examination tomorrow has been cancelled (取消). 

Remember to do this in time of H1N1 ---         constantly the windows to let fresh air enter and move around inside, and avoiding the access to the crowds, a necessity everyday.