The 31st Olympic Games will be held in Brazil ______ August 5th，2016．（ ）
A．inB．onC．at
Could you tell me_____ in Wuhan， please？
Maybe last December．（ ）
A．when did Covid﹣19 （ 新冠肺炎） break out
B．when Covid﹣19 broke out
C．how often Covid﹣19 breaks out
When does the online class begin， Mrs．Grace？
At eight o'clock． Tell Cindy________late．（ ）
A．not beB．not beingC．not to be
How can I avoid the illness， Sir？
_______a mask when going out and wash hands with soap．（ ）
A．WearsB．WearC．To wear
Our city， Shaoyang， is getting cleaner and cleaner day by day．
Yeah． We______a national modern， civilized hygiene （文明卫生） city．（ ）
A．createB．are creating
C．created
Don't forget to protect your eyes well____ you take online classes．
OK． Thank you， Sir．（ ）
A．ifB．thoughC．as if